Wot! That is an astonishing take. But let's keep it as a one-time spoof
I am sure Iron Man will come back, with RDJ either playing Iron man himself, or - that is where "Back to the Future" fits in - in some time travel storyline, which makes him, say, the new Iron Man's ***, and thus being the *** that keeps popping up in reference scenes like in the fiirst Iron man movies. It's not like Iron Man, the comic was not full with partly hilarious time jump stories, I had one comic book, where he was fighting a future Iron man, who was deeply evil, with Excalibur, which Merlin, who popped up in the story, gave to him, that was a crazy story. And once Doctor Doom is introduced into the new MCU in the upcoming second Black Panther, the path to magic/hich tech etc is completely open