I was given a new life. For an entire year, I was able to walk alongside Yuna. It was fun. It really was.
Does this mean something prevented them from living happily ever after in the end?

I'm ambivalent about them expanding the world and story. First of all, FFX|X-2 ended ten years ago. Just let it freaking be. (That being said, though, the FFVII world was further explored through the compilation for more than ten years after VII was released, and I think parts of it, especially Crisis Core, were done very well). On the other hand, I really don't know if I got as much closure with the "perfect" ending of X-2 as I think we should've gotten; it left me with kind of an uneasy feeling about Tidus's renewed existence in Spira, as if it wasn't certain and that he really could just "disappear." If this voice drama focuses on that part of X-2's ending like the preview is hinting, then that's awesome. I just don't care to see indications that an FFX-3 or spin-off could be happening. The essential parts of FFX's plot were all tied up by the end of X-2, so I see little need in further exploring them with more installments bearing FFX's title.

I have a few questions regarding summoners pre-machina war and Sin, so I could totally get on board with something going into further depth about the machina war, though.