Square Enix are notorious for bleeding their intellectual properties dry. You like Final Fantasy? Here's 119 Final Fantasy games, etc etc. And now that Square owns Eidos, things are only going to get worse.
Addressing shareholders following Square's purchase of Eidos, Square Enix boss Yoichi "Imperial Hot" Wada told of the company's success in creating a "number of deliverables from one worldview" for their franchises. Which is corporate speak for "we make a fuckton of money from Final Fantasy spin-offs, anime and toys".