He's not a genius. He's a guy with a LOT of money who hires other people to do the thinking for him. Musk didn't work out how to get a landable rocket booster to work. He just thought of the idea, and paid some other people to figure out how to do it.
If I had his money, I could also try to implement some ideas I have. All it takes is funding. Anyone remember the Space Shuttle? Lots of folks had the idea, not just one person, but it took a LOT of money and a LOT of people to make it a reality.
And how many of Musk's ideas has he paid for that did NOT work, that we never hear about?
Probably proportionally the same amount as NASA's failed ideas.
Musk needs to stop spending his money on trying to get back to the moon, or bullshit orbits in space, or trying to colonize Mars, or sending a Tesla into an eternal orbit with Mars! (WTF was with that anyways? He was just living his boyhood fantasy of the Heavy Metal movie. That move did not escape us, Elon)...
He needs to be on the forefront of FTL tech, theoretical particle physics, quantum theory research. He needs to spend the money for the super-long outlook, not the merest 50 years in front of his face. Oi!