I lost a lot of interest after FFX. FFXII was alright, I suppose, but I couldn't really even get into FFXIII. Neither the game nor the characters seemed to interesting. Seeing them make a 3rd game in the same numbered universe is incredibly weird to me - especially considering the lukewarm response to FFXIII. They should just move onto FFXV (Not only is that number getting ridiculous, I also wish the MMORPGs didn't have to be included in it...) and try to bring the series back to it's less-linear roots. A new set of characters would also help to rejuvenate things.
If they just have to re-use characters, why don't they try something new? Perhaps FFVI, FFVIII or FFIX 2? Nothing much has been done with those characters, and it would be nice to not constantly muck around with the same set.