I'd much rather FF5 or FF6 to get a sort of Bravely Default style treatment than FF7R style. 3D environments, full voice acting, orchestrated soundtrack, etc, but not so overblown in cinematics and over-the-top spectacle. Bravely Default looks like a late-gen PS1 game or early-gen PS2 game, and I think that sort of style could look marvelous with HD assets on modern hardware. It also makes great use of pre-rendered backgrounds, which I think is a bit of a forgotten art of the 90s. FF3 and FF4 already got this treatment, but were heavily limited by the DS hardware. Even the Steam ports look messy. Designed from the ground up for HD platforms though, I think this approach would be great.
Yeah, I really don't need to see Nomura's take on any other classics, to be honest. Maybe FF8. I especially don't want to see FF9 done like FF7R. Nomura's flair just would not suit that game at all.