And GTA V is over the top (perhaps overly), yet feels kinda up its own ass. It's an example of having a story that's TOO in-depth in a video game. It really didn't need that much exposition, but that might just be the fact they tried to take the "three protagionist" gimmick too far.
It's also basically "milk the online cash cow" too. I've never really played GTA Online nor felt a need to.
I don't know if another GTA should be done. I feel like the franchise has run its course.