Just going to jump in and say that I think SE learned their lesson with FFXIII, when they made FFXIII-2. FFXIII-2, in my opinion, is the exact opposite of linear, and there is towns :P! I kind of find it funny how they did did FFXIII-2, here's why:

Director 1: Our fans keep complaining over and over again about FFXIII being linear
Director 2: Fine then, lets show them what we are truly capable of!
Director 1: You don't mean!?
Director 2: That's right bob! We're going to the fourth dimension!

In all seriousness though, I would like to hear your opinions of FFXIII-2, and whether or not you have hope for FFXIII-3.