You either die a hero… or you die a hero and then live long enough to see yourself become the villain

Honestly wondering what trick the MCU is going to pull to make RDJ Jr. being both Dr. Doom and Iron Man make sense. Maybe he’ll just never have his mask off when RDJ Jr. is the actor, or maybe it will be multiverse shenanigans. I hope it won’t be like Coulson/Sarge in Agents of SHIELD wherein one is essentially a cosmic clone of the other.