Your doctor now has a machine that can instantly tell exactly what's the matter with you. Unfortunately it doesn't confine itself to what's the matter with your health, but also tells you exactly what's the matter with your dress sense, your IQ, your political opinions, your tastes in books / films / music / romantic partner / etc....

I wish I could sail on the Dawn Treader!

You can, but it's a small fishing boat up north, not the Narnian craft.

I wish I had a dog.

You now have a dog but only for a day as someone asked you to watch it for them.

I wish I had the One Ring.

You have the One Ring, but like Frodo, you have no choice but to take the perilous journey to take the One Ring to the fires of Mount Doom.

I wish I had gotten the flu shot. It's no fun being sick.

~Wunder

You did get the flu shot, but unfortunately they used the wrong serum and you turned into a dragon instead. (Don't worry, I'm sure Aslan will be along soon to un-dragon you...)

I wish I could have less work and more holidays (and still afford to live, of course).

Sorry, your wish is so self-evident it is almost an unkindness to respond. Yes you have less work & more holidays, but only because the economy has gone bust & the so-called "holiday" is full of futile job applications, which are no fun at all, even when the occasional interview does arise.

I wish that the electricity bill to arrive next month will be more affordable.

The electricity bill arrives and is more affordable, but only because they shut it off so you couldn't use it til you paid.

I wish I could teleport rather than take the bus.

Lo & behold, you can teleport, in much quicker time. But there are still buses, which stop & start for people who need them, & who if pedestrians & teleporting people get in their way, will collide with them, according to the laws of physics....

I wish I could get a haircut that is easy maintenance, looks good on me 100% of the time, & doesn't cost me a fortune every six weeks or so.

You get a haircut that is easy maintenance and does look good even if it was cut by a student at a beauty school for free and looks uneven in some parts but that seems to be a style in itself.

I wish my homework would finish itself.

Your homework now finishes itself, but gets all the answers wrong.

I wish I could afford first class air travel every time I go back to Australia.

You can afford first class air travel every time you go back to Australia, but you can't afford it on the return journey from Australia to England.

I wish that I could have a song that I've written become a hit in the charts.

One of your songs has become a hit in the charts.... of scientists who are analyzing various songs to decipher a mysterious code.

(I think I would be happy if anyone bothered to put music to the lyrics I've written and recorded a track )

I wish I wouldn't get sick when I have so many deadlines.

~Wunder

Granted. You don’t get sick, but your deadlines have been moved up.

I wish all my devices were wireless.

Your wish is granted & all your devices are wireless. As are the vacuum cleaner, the fridge, the washing machine etc. The trouble is, they all start telling you what to do & when to do it.

I wish there would be no more bushfires until next spring.

There are now no more bushfires until next spring, but that's because it doesn't stop raining until then.

I wish we could have snow for Christmas in England!