He's eliminating gas vehicles, improving solar adoption, fixing rural internet, improving space science, making life interplanetary, etc.
It may be that Elon Musk types are extremely rare but I doubt they're as nearly as rare as most people think and we only need a thousand out of billions. The thing that makes him extremely rare, I think, is that he lucked upon a windfall of $200+ million from PayPal, a startup success that he had almost nothing to do with.
Now that I think about it, an Elon Musk Prize funded and designed by Elon Musk would be viable. His current net worth could fund 600+ Elon Musks. Elon Musk could create more Elon Musks...it's almost too simple!