Honestly, I believe that earthly time does not matter in Aslan's country, Lewis frequently said that for God, there's no such thing as time:

"We are so little reconciled to time that we are even astonished at it. “How he’s grown!” we exclaim, “How time flies!” – as though the universal form of our experience were again and again a novelty. It is as strange as if a fish were repeatedly surprised at the wetness of water. And that would be strange indeed; unless of course the fish were destined to become, one day, a land animal".

(btw, physicists are now saying the same: https://www.newscientist.com/article/dn24473-entangled-toy-universe-shows-time-may-be-an-illusion/)

So IMO, once you're in Aslan's country, there's no such thing as "people left on Earth", you get to meet everyone who eventually made it there, including those who were still alive when you died (and I like to think that the Pevensies met Susan as well at the very end of TLB).

Posted by: @highkingpete

If you could go there with no cons (except leaving your own reality forever) would you?

I don't think so. Everyone learns from their mistakes and mistakes are important to life. Although, your life would be perfect and their would be no need for mistakes, you would never learn or grow or have any development at all because you would never have any mistakes. I would never want to leave my own reality because when people's lives aren't perfect, they learn their strengths and their weaknesses. They also learn something very important about life called Empathy. Without your own mistakes and problems and pains to back you up, you would never know how someone feels to experience pain, since you never experienced any yourself. Pain is always a hard thing and many people don't deserve pain they get, but sometimes pain is important. It helps others to show compassion and empathy (like I mentioned before) based on their own experiences. They judge situations differently and look at things through different perspectives. Pain helps make us define what personality we have as humans. 

Posted by: @highkingpete

If there are feelings of sadness (grief), and anger present, would their existence be a truly perfect one?

Of course. Their life, while not 'perfect' in the way we mean it, is still the best they could possibly live. I think it is the fact that they don't have the fear of expectations and duty and the relief that they don't have to keep to the schedule as work provides. They can take this 'life' one day at a time, at their own pace.  The feeling that they don't have to worry about things that happen on Earth, or in Narnia, the fact that they don't 'have' to do something, and the ultimate joy of living with Aslan forever. That sense of protection helps create a calm paradise for them. 

Although, they may feel the grief of losing Narnia, separation from their sister and dealing with the fact that they will never be alive again, I think because they have so much time, it helps them deal with problems.  For example, if they miss Susan in Aslan's country, they know that they can wait for her to join them. The loss of Narnia can mend over time by spending more time in Aslan's country and with Aslan himself. 

I also think that though they have the choice to show anger in Aslan's country, it wouldn't last very long, or wouldn't happen at all. I think the peace and happiness of Aslan's country gives them no reason to be angry about something. If they were angry about something, like I said before, time will help them mend, their anger or grief, whatever troubling emotion they are feeling.

Posted by: @mickey

I like to think that the Pevensies met Susan as well

I think the same! I like the feeling that Susan eventually joins her siblings after some time spend on reflection and thought. 

It’s an interesting idea for certain. Anger, sadness, depression, grief, malaise, malice, spite, hatred, jealousy, ennui: all of these negative emotions are such a part of every day life us, and it can difficult for us to imagine what a life without any of these feelings could possibly entail. As much as they’re tiresome… those emotions certainly add depth to our lives. 

If we thought of life as a book, what a boring book it would be if there was literally nothing bad that happened in it. “Badness” so to speak drives the plot of the book, the thrust of character development, the day to day actions of life “within” the book. Take all that away, and, while the characters in the book might appreciate it, what a hum-drum story it would be.

 Until all of us characters (and for the characters of the Narnia books as well) are off their pages and with their author… it is difficult for us to imagine what life without any negativity would be like.

@digorykirke I used to think that in the next life I would have none of the physical challenges I now have, and be beautiful as well. More recently, I believe that I will be me as I am, but it will all be positive and not a problem, and the beauty I have now will be seen as glorious!

In the same way, I think that the pain and problems of our lives on earth will not be forgotten, but they will be transformed into something beautiful.

Posted by: @coracle

In the same way, I think that the pain and problems of our lives on earth will not be forgotten, but they will be transformed into something beautiful.

I like the way you said that, @coracle 

It really emphasizes  the feeling of a better or newer life. It doesn't make it feel like everything around us  is perfect, but more of we see things or our  problems in a more perfect way. 

Posted by: @highkingpete

I'm wondering how the meaningfulness of a life is carried on when it's distended over a forever, and how that could change the emotions of the inhabitants of Aslan's country to feel, when they have the baggage of people they left behind to think about for a while.

      I love this conversation! I believe that some of the emotions (mainly sadness/grief and anger) you have mentioned aren't going to be in heaven for the exact reason you have said. That is not to say they are inherently evil, I don't believe they are, but that is to say seeing as our existence in heaven will be perfect, their will be no need for them. We won't remember people or things that were hear on earth and aren't in heaven, so thus, no sadness. We will have absolutely nothing to be angry at/about, so thus also no need for that emotion, as there was here on earth. So why did Lewis put these things into Aslan's country? Well, seeing as he was an imperfect being, it is therefor logically impossible for him to create a world that is perfect, and if he really tried, (as I said before) there would have been no sadness or anger, and without those that part of the story would have been terribly boring to read. But the meaningfulness of life will be fulfilled because we will be in constant communion with God, and compared to that, all that we call the meaningfulness of life will be but dust and ashes to be thrown away and forgotten.

Child of the King: SonofStone

For me, it all comes down to the fact that none of us on earth can say with absolute certainty "what heaven will be like when we get there" — Lewis himself or anyone else. (There are near-death experiences, of course, which often have some consistent things in common, but there's plenty of controversy as to what those accounts prove, or not, so I won't go into that. I don't know if Lewis knew of any of them, anyway.)

To me the point is, Lewis was writing a fantasy series for young readers, giving us perhaps some ideas of what heaven may be like — but I'm guessing he would have been the first to assure us it's not an exact representation from firsthand knowledge. I don't think he meant any of us to take it as gospel, or to get too picky over whether or not it fits exactly with any particular Christian theory or theology.

There was another recent discussion here where one forum member suggested that when they first go through the stable door, Tirian and the Friends of Narnia are somewhere that isn't quite in Aslan's country yet, and that's how the unrepentant and self-blinded Dwarfs can be there with them. I'm not sure if that's what Lewis intended, as there's plenty else in the scene that suggests they ARE already in heaven — the fruits that would make the best earthly fruit taste poor by comparison, the vanishing of everyone's aches and pains and old age, the fact that they already sense they've come to the country where "everything is allowed" (implicitly because there's no sin and therefore no harm). And yet, this is also the stage where the characters do still experience resentment over Susan's rejection of Narnia, and grief for the old Narnia's destruction when they witness it. So there is some ambiguity there as to how completely "in" heaven they might be at this point.

I'm wondering if Lewis was meaning to imply that, while they certainly are in Aslan's country, their experience of heaven deepens as they go "further up and further in" — that as they progress deeper into it (and discover another new Narnia within the one they're already in, with the implication that this will keep on happening!), they're rising higher and higher in a spiritual sense, so they progressively lose whatever remained of those earthly feelings of sorrow or anger or anything else un-heaven-like? We do get the clear sense at the end that Lewis's concept of heaven isn't a static one at all, even though it is perfect — especially as we're told in the final line that they were now "beginning Chapter One of the Great Story that no-one on earth has read, which goes on forever; in which every chapter is better than the one before." That's the best I can make of it, anyway.  

(Apologies if that quote at the end isn't accurate. I'm away from home and don't have my Narnia books on me, so I'm relying on memory!! If anyone can fill me in if I've got the wording wrong, I'll gladly edit it, thanks — or else I'll check it when I get home tomorrow.)