Seems like a goldmine of content for them to work on for the next decade+. Plenty of people will never experience these worlds or stories due to the turn-based combat, so giving them the Remake treatment could be the only way an audience ever finds them.
I would like to see FF8 remade next. It’s the next logical choice becauase 8 comes after 7 and it’s a solid world to leave the FF7 rut for.
The rest could be good, too, but FF8 would probably be the easiest to pull off successfully.
If by capital “R” Remake you mean the full three-game treatment FF7 received, Kitase’s already said they’re not planning on doing that again. Future remake projects, should they happen, will be smaller in scope. An FF9 project was leaked twice and is heavily rumored, so it’s most likely next (if it wasn’t quietly cancelled, anyway). We also don’t know exactly where it would fall on the spectrum between remaster and remake, but the Epic leak suggests it’s more of a remake.
FFT is the one I’d like to see the most, and it has even more rumors around it. But, I would expect that would look something like Tactics Ogre Reborn, mostly a remaster. It could really use some modern features, like a move undo and some UI enhancements, like a helper for zodiac signs. What I want the most from it is an orchestrated soundtrack. It’s a gorgeous work that deserves the full treatment. I’d also love to see more content, like extra side quests, but I’m not holding my breath on that.
FF6 is the most logical next step after those in terms of enduring popularity, especially if they want to target the Western market. It would probably be super controversial in the fandom, though.