I liked the idea of him and Banner being separated permanatly. Why? We've SEEN Bruce get angry and out comes Hulk. Yes that's what makes The Hulk unique as he's a modern Jekyll and Hyde, but it gets a little old. Let Hulk be a hero without Banner around or better yet! Have Bruce be his sidekick, that would be interesting.
Seriously Bruce on the outside, working WITH Hulk where they can communicate and interact in the open. He's the brains and Hulk is the smasher. Come on, tell me that would not be an interesting idea to keep around for a while. I realize there has been something LIKE that happen, but not where Banner himself is in the Rick Jones or Amadeus Cho role.