I don't think anyone can say for certain what Square will or won't do in the future. They ported FFVI on the IOS and redrew the backgrounds, characters and enemies and they didn't seem too worried about the backlash they would suffer if they screwed it up since VI is normally mentioned in the same breath as VII as one of the greatest Final Fantasy games of all time. And unless I'm just out of touch, pretty sure they'd make back whatever the cost would be for remaking VII.

Personally, I don't care if VII is remade or not. I'd want Square to start getting their act together before remaking any more of the old games.