I could see hulk leaving the avengers after A1 (sort of how he only lasted one issue in the comics as a real avenger) and then have his tv series take place in the weeks/months after avengers events. that way at the very least it would leave room for references to banner/hulk galore, and the possibility of a return in a future avenger film or an appearance in another movie since it would still be in the same universe..
I also think the TV series could be a good lead into another Hulk movie. You'd have the TV format lay all the groundwork for a theatrical release tied into the series, and all that. There are endless possibilities and scenarios. Here's hoping for the best.