And apparently 3/4 of Avengers movies are going to consist of Avengers fighting each other rather than some enemy. They're like the least cohesive fighting unit ever.
Yeah, I'm guessing that Avengers will assemble, Hulk will smash, Ultron will go down, Hulk will CONTINUE to smash, Avengers assemble to take down Hulk, devastation all over the place about what these superheroes are doing unsupervised (Tony making world-dominating AI, Hulk able to level cities if he stubs his toe), leading everyone to call for them to be made public and fold into an existing command structure (Civil War).
LONG TERM
Ant Man will be a heist movie where they steal an Infinity Stone that will turn out to be the Eye of Amgarotto, which brings Dr. Strange into the picture. Meanwhile, Guardians, with the help of Warlock (who escaped during the end scene of Guardians 1, if you missed it) will try (and fail) to prevent Thanos from gathering almost all of the stones.
LONGER TERM
During all of this infighting and nonsense, Thanos invades Earth to recover the last stone from Dr. Strange. Hulk smash, Thanos will smack him around, Hulk smash again, Thanos will smack, smack... HULK ULTRA SMASH, Thanos knocked down enough for Warlock to snatch the stones away, Thanos defeated... Hulk still smashing. Takes everything everyone has to put down Hulk.
LONGEST TERM
Realizing that Hulk is insanely risky to even have on Earth, Avengers drug him and pop him on a spaceship to have him live on a distant world away from all life. Hulk wakes up, freaks out, causes the ship to crashland... and thus begins PLANET HULK. And, of course, the follow up WORLD WAR HULK.
Oh yes.
That's my prediction, at least.