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.
I don’t think anyone’s claiming it’s difficult, it’s just more of a risk. If you’re the investor calling the shots with your big bag of money do you choose a new idea which might be great but people might not like, or to rehash an existing idea that already has fans who will buy more of the same? The decision is entirely financial.