The biggest reason would be the...I don't know if appeal is quite the right word, but something along those lines, for the characters who wish to ultimately face down or even become the regions champion. And the traditional roadblocks to that, besides an Elite 4 and Victory Road, is the 8 required Gym badges. I don't know, maybe I'm just attached to the system and the work it encourages battle happy players to put in to earn a final victory. Just something I'd enjoy and I think would provide some interesting plot points.
New location up! (Cici's going to have to go there at some point...)
Well, I mean, Tommy and Cici are bound to go their separate ways eventually, but I would hope it's on good terms.