Let's be honest, here.
FF 5 and 6 will be remade into 3-D and slapped on the DS. FF3 was high quality and everybody bought it, and they realized that actually making good games on a system with a massive userbase makes them money, which is why FF4 followed suit. If you don't think FF5 and FF6 won't be 3-D'd and put on the DS you most seriously think square enix doesn't like money.
As for potential FF7 and beyond remakes, they won't be hitting the PS3. Ever since the PS3 bombed around the world, every major project has quietly shifted from PS3-exclusive to being multiplatform with the 360 (which has only bombed in japan) simply because developers thought the PS3 was going to steamroll the entire market like the PS1 and PS2 did and when they finally caught onto the fact that the PS3 is a large steaming pile they began shrieking at their underlings to make a quick and sloppy 360 port so they can at least make SOME money off their multimillion dollar title. The only ones that haven't have been FF13 and MGS4 because their developers are stubborn, and you can bet that their corporate overlords will somehow change "PS3 exclusive" into "PS3 exclusive for six months and then a version on the 360 releases with extras" like Resident Evil 4 or Metal Gear Solid 2 and 3 or Tales of Symphonia.
Meanwhile the Wii has taken off like nobody had prepared for, selling more than the Gamecube ever did in just under a year and on track to smash the record for most copies of a console sold in a single generation that the PS2 set last time around. So for the first year or so of the Wii's life, all of those developers that sunk millions of dollars into major projects on what they now know are failing systems, while the one they thought would flounder and die has cemented the first place spot, making said developers scramble to shit out anything possible for the Wii in attempts to cash in. By now, that stage has largely passed - with the exception of the cheapo makers of Ninjabread Man or Anubis 2 or Counter-Force, all of the developers in the gaming world, after dumping their 4-week production time shovelware to try and earn a quick buck off the Wii craze, now have actual time to build good Wii games, and they're all beginning to look absolutely amazing.
What does this have to do with FF7? Well, it's simple, really - Square Enix will put it on the Wii if anything else.
No. FF fanboys, shut up. Do not begin to type BUT FF7 WAS FIRST ON A SONY CONSOLE or whatever inane retarded comment you wish to make. You are wrong.
Wii is where the money is at, and it will likely stay that way for the remainder of this generation. PS3 is dead everywhere and 360 is dead in Japan, the largest selling audience for FF games. FF3 sold amazingly well on what everybody once thought was just a failure of a handheld that would crumble under the weight of the PSP. What makes you think it won't happen the same way with a FF7 console port?
Hell, even the 'started on sony' excuse can be used to justify a Wii FF7. "Nintendo gamers haven't played FF7 yet so we feel it's time to bring them that experience." Recognize the spiel? Yeah, Capcom used it to justify RE4 on the Gamecube.
tl;dr - FF7 will be on Wii because no other console has the userbase to even justify putting it elsewhere.
