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 dad, and thus being the dad 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