If true, that diminishes my respect for Elon just a touch. I mean, OK, I get it... when you're trying to change the world, you want passion, you want commitment, etc. Fine. But here's the thing: in the end, you're just as dead either way. Change the world, you're still dead. Don't change the world: You're dead. The only thing that really counts in many ways (if such a thing can be said to even exist) is what happens "between the goalposts" so to speak.
If I were working for Elon and he said something like that to me, I'm pretty sure my answer would be "bugger off". You only get to witness the birth of a child once, ya know?
It's also important to remember that, as a founder, you'll never find people who are exactly as committed to your project and your ideals as you are. You just can't. It will always be your baby, and it will always hold significance to you that it will never hold for anyone else in the world. You may find people who are committed and passionate, but they still won't be you. To expect otherwise is folly.