Square Enix needs graphics for those games... For a while now they have been more like movies instead of games.  Everybody whos played a Final Fantasy game lately must have noticed how many cutscenes there are... The focus on Final Fantasy seems to have just turned into cutscenes and stories... Granted, the storylines are extremely involving, but its just seemed to have gotten really laid back on the gameplay, making it unsuited for a nintendo console.

But if they want to remake Final Fantasy VII for the Wii, they are totally welcome... ;)