The two movies I want to see the most are HHB and MN; I would hate for LB to be made after SC as that would end the franchise. My personal opinion is that HHB should be after SC as the Pevensie children will be the right ages--in the books they seemed to be in their 20's. Audiences will be wanting them back and HHB is the best movie material IMO. It is also the favorite of many fans including mine. Then, MN has to be made before LB as it explains Polly Plummer, the rings, and why Aslan has the right to destroy and remake Narnia as He created it in the first place. Also, Tash is only introduced in HHB. LB would not make a lot of sense without the background provided in HHB and they'd have to do a lot of changing or explaining him and the Calormenes without it.
Psalm 37:25 "I have been young, and now am old; yet have I not seen the righteous forsaken, nor his seed begging bread."