Usually we see quite a few Final Fantasy games during a generation:
Final Fantasy I-III on the NES
Final Fantasy IV-VI on the SNES
Final Fantasy VII-IX on the PS1
Final Fantasy X-XII on the PS2
and now Final Fantasy XIII on PS3 and X360
By the time Final Fantasy XIII comes out it will be late 2009 early 2010 for the english version, that's 6 or 7 year's in development. (I believe the development started in 2003)
Now I know Final Fantasy Versus XIII will be coming out as well and it will likely come out shortly after FFXIII (maybe a year later), but it's a spin-off game and is going to be a action-RPG which is different from the usual Final Fantasy games.
So by the look's of it there will probably be only FF XIII for this generation. Unless the developing of FFXIV is a lot easier and quicker for them sinse they should know the cell of the PS3 like the back of there hand, thing's should go smoother.
Anyway, so what do you guys think will there be a Final Fantasy XIV for this generation or will it be for the PS4, and possibly the NexBox, or even Wii2? :O