If they continue to build the Marvel cinematic universe and it continues to be as successful, I don't think they'll reboot Iron Man... I think they'll just find a way to write RDJ out and a new person in.
@Mokong X\-C I wouldn't say it's a surprise he's only signed up for Avengers 2 and 3... I'm not sure anyone could realistically expect anything else, as the Phase 2 and 3 films already fill up all the space in between, there's no room for another Iron Man film until after Avengers 3 and by then I think RDJ would definitely want to be moving on to something else.
I'm just really happy this is all signed now and we get him back!!
With his last two films earning over $2.7 billion I'm not surprised everything worked out!!