I think it's mainly due to Square-Enix themselves not knowing where they should be going with the series. With FF 13 they essentially tried to target a broader audience by making the game more accessible. While some of the things they added are commendable, that's not how the series should be headed to moving forward. FF was all about story, interesting battle system, and a gorgeous expansive world. These three are things they need to start focusing on just like they used to with previous entries.