A new mmo would certainly solve the issue of technical debt. It's a sorry state to be in where your main game is getting styled on by the mobile port. I do think it's hella copium though.

Personally if I were to dream, I'd love an mmo that took place entirely in the Ivalice setting. A strong unifying vision and theme would do a lot for me. A "best of" final fantasy theme park seems like a nice idea, and maybe it works for some (or even a lot) of people, but to me it makes the world feel incoherent and dissonant, especially lately as they pile more and more on top of it