The good guys are tired, S.H.I.E.L.D. has been destroyed, and theres no one else for the planet to turn to when menace looms on the horizon. Everyone wants a breakand thats exactly how theyre about to be broken. Theres no abdicating heroism.
What you said about abdication is apt, but I think its also about recognizing limitations, Robert Downey Jr. says. The downside of self-sacrifice is that if you make it back, youve been out there on the spit and youve been turned a couple times and you feel a little burned and traumatized.
For better or worse (trust us, its worse), his Tony Stark has devised a plan that wont require him to put on the Iron Man suit anymore, and should allow Captain America, Thor, Black Widow, Hawkeye, and the Hulk to get some much needed R&R as well. His solution is Ultron, self-aware, self-teaching, artificial intelligence designed to help assess threats, and direct Starks Iron Legion of drones to battle evildoers instead.