After watching Logan, I'm even more convinced that they should push the tone of the MCU movies.
Having a Hulk movie that turns into a psychological action drama could be the much needed change of pace from the stagnant Marvel formula.
I actually like the idea of Joe Fix it taking over for part of the movie, so you get a gangster movie at the beginning. Maybe rival mob bosses hire there own super villains like Crusher Creel to fight Hulk. The movie is still in the MCU, and I wouldn't want it to stray too far away from comicbook action.
Break up the tone with flashbacks and moments where you enter Banners mind and see visual representations of his personalities. The motivations that led to him creating the Fix it persona etc.
The movie can evolve into Banner leaving Vegas to find himself again, but the fall out from his Joe Fix it day's follows him.
He tries to rebuild his life (maybe has accessed science/Banner Hulk by now), but he ends up having to fight against the mobs super powered forces. (Creel, Ufoes, etc). Overwhelmed by the volume of enemies he manifest's Savage Hulk (The Beast).
Haven't thought of a decent 3rd act or way too end it, but I think juggling 3 personalities would be interesting and different for a big budget superhero movie.
Except Creel is a government agent in the MCU. I'd like to see Leader since that subplot was dropped.
And I want to hear internal monologue between Bruce, Hulk and Joe arguing with each other. Something like this.
Joe: So, this leader guy. I'm gonna blow up his whole operation.
Bruce: No, Joe. Think about the collateral damage.
Joe: I'm doin' it anyway. For the greater good.
Hulk: Hulk no want smash henchmen doing job! Hulk only want hurt Leader!
Bruce: It's two to one, Joe. Don't make me take over.
Joe: Fine. No bombing the place. Can I at least beat up his goons as long as I don't kill 'em?
Hulk: Hulk like beat up henchmen!
Joe: Fine. I'll stick to fists. leader better not get away this time.
Hulk: Hulk friend try to talk to Hulk!
Marlo or Amadeus: So Hulk, the Leader is planning a Gamma Bomb attack on Las Vegas? What are you going to do about it?
Joe: Hulk smash puny Leader!
Joe (internal monologue): Look what you made me say!
Hulk: Hulk think that funny!
And the whole time Hulk is staring off into space while somebody like Marlo or Amadeus is trying to talk to him and we hear them in the background.
Also, if there is a Hulk sequel, we need characters like Marlo Chandler, Jennifer Walters, Rick Jones and Amadeus Cho since they ground the Hulk. (And I noticed that Marlo is the only major supporting character not in the Pantheon who never gets gamma powers.)