I think they might do it if Advent Children turns out to be profitable enough. I hope they don't though. Very few FF games left loose ends the way FF7 did. (SPOILER) In FF4 everyone just becomes king of wherever they're from, except Kain who realizes that Cecil totally snaked him. FF6 had all of the characters's plots get resolved before Kefka's tower. In FF8, Squall gets saved by Rinoa's love (for some weird reason that never gets fully explained) and that's the end of that. I never saw the endings of the games I didn't mention, so I'll let someone else handle those, but there's really not much further story to develop there. In FF7, (SPOILER) many conflicts are resolved before the end of the game, but when you beat the game, you have no idea what happened. It is alluded to early on that even if you stop meteor, everything will die. While the ending clearly shows that not EVERYTHING died, the fate of humanity is questionable. I have no idea how they're going to make a new story for the existing characters, or what role Sephiroth is going to play, but it's clear that they have something. Hopefully, it's not going to just be a stupid excuse to bring back popular characters in a money making effort.