Okay, so we have fights in the present and fights in the past, sooo why not develop a fight system that takes people to the future? It's a thought. Perhaps in the future chocobo's can fight along side their owners. Or perhaps BST can control them to fight. This would allow for an entirely new set of mobs to be introduced and maybe old enemy's have joined sides to fight this new threat. Yes, it's kind of sci-fi ish, but I think it would be neat. And at long last those that have mentioned the time mage, well the new system would allow for it. A time mage could transport players to the past, present and future. They could also draw upon new futuristic spells. May not be the best idea in the world but by far it cannot be the worst.
One side note to the idea. This would be a logistical nightmare, but the future fight system could actually be an area that pits 11 players against 14 players. Yes, yes I know it's two different systems but the new area could adjust accordingly so it's fairly equal. Perhaps this this be 11's future fight system and 14's past fight area. I'm not a programmer so I have no clue if it would even be possible, but it would at least introduce players to both systems.