Good theory and read Jordan! I know in the comics Tony Stark does go a little crazy. I never read the comic books but you can see it in the movies that Tony Stark can be rather erratic. It’s definitely apparent in Iron Man 2. The major cause of this I would theorize is Tony Stark being exposed to a variety of traumatizing scenes. Much like with him going into the void, getting those flashes of everyone dying, etc. I think Tony will either live but go crazy at some point in these films, or like you said, die and be brought to life.