There could be a world where mineral supplies are exhausted/inaccessible to the point that extraterrestrial metals are needed to maintain the supply chains we need to feed billions of people.
Edit to say - that's probably a long way off / not likely
> There could be a world where the muon radiation fallout of WWIV has contaminated all unmined terrestrial mineral sources.
All unmined terrestrial mineral sources? I don't know what the heck you're talking about, but that sounds like a world where everyone's dead. Pretty sure all the bomb shelters in the world are shallower than the deepest mine.
Edit to say - that's probably a long way off / not likely