If they made an entire specific (seamless) zone perhaps behind the main cities made for the idea of building your own houses or something, that could work. I like the idea of player-made villages though. I've yet to play a game that can actually implement the player housing well. Perhaps they could use it as a way bring moogles back into the forefront of the game? Each house has one, like in XI, but they help you with building your house, decorating, etc etc