From a sales P.O.V., Final Fantasy VII Remake should be on the Wii, for several reasons.
1.) Now that S-E has thrown their support behind the platform with DQX, they have no choice but to go "all in" and make sure there are lots of RPG fans on the system.
2.) Unlike DQX, a FF7 Remake could really sell a ton in North America and Europe where the Wii's userbase is exploding faster than anyone could have imagined. Time to cash in.
3.) It would follow the successful business strategy S-E has employed on the DS (FF + DQ remakes) to the Wii. Plus there are many Nintendo fans who never really played the originals on the Playstation, this is a good chance to introduce the game to a new fan base.
The PS3 honestly hasn't sold enough to get such a title ... tough break for Sony, but Square-Enix has to look out for themselves and they'd be crazy not to have something big that can sell worldwide (NA + Euro + Japan) for the Wii.
The only chips S-E has to play in that regard are either a FF7 Remake or Kingdom Hearts 3, either one would sell 5-6 million copies on the Wii worldwide easy IMO.
