There's nothing stopping other rocket companies from doing the same thing Musk is.
What if at-scale rocket science is just extremely hard, and efforts to find "another Musk" continue to fail?
Blue Origin was founded in Sep'00, didn't reach orbit until Jan'25, and probably won't manage 2 more successful launches (to orbit) until more than 2 years after that. Other than burning money, have they ever demonstrated that they can reliably do something at a serious cadence and scale?
Vs. SpaceX was founded in Mar'02, reached orbit in Sep'08 (on a relative shoestring budget), and succeeded with 18.9* out of 20 Falcon 9 launches in the first 6 years of that program - while fielding two major upgrades to the original version. When their AMOS-6 mission blew up on the launchpad (Sep'16), they were launching again in 4 1/2 months.
Bluntly put, there seems to be a "Right Stuff" in the rocket biz, and it really doesn't look like Jeff's got it.
*The .9 was a primary mission success, but failing to successfully deploy a secondary payload after the loss of a first stage engine at T+79 seconds - https://www.spaceflightnow.com/falcon9/004/121114anomalies/