That would be extremely unlikely, Disney/Marvel certainly wouldn't back themselves into a corner like that. He might be the only person allowed to be Tony Stark on screen until his current contract expires, but beyond that it's anyone's game.Gorfias said:I wonder if Downey signed a contract stating no one else can play Stark? If not, that is what I'd like: a new actor playing the character.
I think this (and the impending departure of Chris Evans) is a massive opportunity for the MCU, sooner or later they are going to have to start killing people off. Whilst they've killed a couple of side characters (like Friga) they've been relying on deus ex machina somewhat to keep the established characters kicking, it would help them long term to establish that actually anyone can die in the MCU and re-establish some suspense.
What would really impress me is if Disney/Marvel were brave enough to kill one or both of them off early. That would be a suitable raising of the stakes (and stop people like me guessing plots in advance) and they have the money spare to just buy an actor out of contract if they want to (or have them appear in flash back etc).