Breed, are you ---------? Hironobu Sakaguchi, the creator of Final Fantasy, hasn't directed a game in the series since FFV. Since then, there's been a different director for each game.
They don't have a single "guy thinking up stories." The games are produced and directed like movies. Hironobu Sakaguchi was pressured to resign from Square Enix after the failure of The Spirits Within.
There is a Final Fantasy game coming to Xbox360, and that's FFXI. While it isn't a standard Final Fantasy game and is most likely the only Final Fantasy game that will be made for the Xbox360, Square Enix is signed on to develop games for Microsoft past that.
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