It would be mildly successful if they made a movie, with ACTUAL ELEMENTS OF FINAL FANTASY in it. ya know... magic, chocobos, moogles, airships, Cid, black and red mages with their iconic hats. Include at least 2 or 3 of the above icons, make it a good story that fits into 2-2.5 hours of a movie, and profit.
I do not think a real Final Fantasy movie would be mildly successful unless they gave it a heavy epic spin like the Lord of the Rings trilogy, and it would still be a very risky move, as these types of films rarely see the top box office hits list.
I agree. While there'd undoubtedly be a lot of interest from people on this community and people interested in gaming in general, I don't think that it'd be be that successful a film at box office. A critical success, maybe, but almost certainly not a commercial success.
Not my words Carol, the words of Top Gear magazine.