I would make the game have flashy new 2012 graphics with terrible VA voice acting and the sound of Tidus laughing, Kefka's new laugh and a cutscence every 2 seconds and a battle system where you collect the monsters like Pokemon and the ending would be Terra falling down from the sky with To be Continued at the end.

Sounds good eh ? Well SquareEnix these days seems to think so.

Oh and Mog, Umaro and Gogo will be DLC instead of finding them throughout the game and you'll have to pay $2 for them each, and there will be costumes like a sexy anime maid costume for Terra and a Assassin's Creed cloak for Locke.

Best Final Fantasy ever.

Oh and don't forget to make a Terra Returns with just her controllable. Sounds awwe-sume.