Well apparently SE does and so they have announced they are going to try and cut back development time so they can release FF either annually like Madden or Assassin's Creed or bi-annual.

News: Square targets new Final Fantasy game every 1-2 years - ComputerAndVideoGames.com

Thoughts? I'm not sure if they can pull this off really well. Many of those games they mentioned they are trying to follow don't have drastic changes from each other from year to year.