One concern I have over a potential "Avengers 2" is over-crowding. This film has 6 leads that I doubt plan on retiring after "defeating" Loki. If a second global threat were to present itself down the line, these 6 characters would be likely to return to the team. Now there's talk of Doc Strange, various Ant-Men, Wasp & Black Panther. So what's that? 10 leads? You'd need a 4-hour movie to juggle exposition for all of them and avoid another Mortal Kombat: Annihilation. Personally, I'm hoping after IM3, Tony/RDJ steps down - opening one slot for a new Avenger. Perhaps Banner will walk away after this film too. These guys have had enough exposure already anyway, so I'd rather see Black Panther & Doc Strange movies instead of Iron Man 4 & Hulk 2. Widow & Hawkeye will probably never get their own films so I'd like to see them exclusive to Avengers films. Same with Fury. As far as the team aspect goes for Avengers 2, this is what I'd go with: Cap, Thor, Doc Strange, Hank Pym, Wasp, Black Panther, Widow & Hawkeye.