The trouble with "sequals" (and I consider a next generation a sequal here) is that it never matches the success of the original. Final Fantasy always was unique in the concept of making each new game a fully new story, with new characters, backgrounds, and only a few common key elements like Espers/Aeons/GFs...
Trouble with sequals is that people know the characters, so the element of new backgrounds and some game time spent on getting to know them gets lost. Also people have expectations that it'll match the first game, and it rarely ever does.
I'd say stick to the current concept. If they go on, then great. If they stop, so be it.
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