Luke Cage introduced in Avengers 2, Hulk blasted into space
This is my theory. Cage is introduced as Nick Fury's old buddy from the mean streets of detroit or wherever. That story will be told in a retro story with iron fist set in the late 70's. Cage will be used to surprise attack and muscle the hulk into a vibranium rocket to send him to space and replace him on the team until the final movie when a pissed off hulk returns to a world destroyed by ultron. Obviously the hulk will have a bone to pick with cage. Could this work?