I hope you're right, but in reality most people haven't even heard of Elon Musk. I've had to explain to many highly educated people what he has done, what SpaceX is, what Tesla is etc. While he's been rather successful so far, he's not in the clear when it comes to either of his companies right now, he's not exactly at the Gates level of success yet. I'm rooting for him though, he has the potential to be one of the most influential people in a long time if things go well.
3 months ago, none of my non-tech friends knew who Elon Musk was. In the past month or so, I would say 50% of my friends now not only know who he is, but praise him and his work. I think that by the end of this year, you will be hard-pressed to find someone that doesn't know who he is.
Musk is not financially Gates but he's already had a greater impact. PayPal, Telsa, SpaceX, and even that Solar company could easily be more important than creating the most successful PC operating system. The PC boom would have happened without Gates but Musk is pioneering entirely new business categories.
No he hasn't. He could, but not yet. We have other payment processors, car companies, solar companies, and we went to the moon over 4 decades ago. Musk is really awesome, but don't discount Gates. Frankly, his philanthropy might be more important than Windows, and the stuff that Musk has done.