In hindsight, how could we all have fell for this? What a profoundly stupid idea, but I distinctly remember at the time it felt right.
I guess what I'm saying is that I think a lot of people just wised up and started seeing through his B.S.
When I first saw it, my thoughts were 1) it can't possibly be that cheap, and 2) the turning radius!
It's not that it can't be done. It's that it would probably cost like the very expensive Chūō Shinkansen maglev, which really does work. And has all those necessary things Musk hand-waved, such as emergency access shafts in case there's trouble deep under a mountain, cross-tunnel connections for emergencies, fire suppression...
The biggest of Musk's warning signs, for me, was the hype. Hype can drown out valid criticism. When the hype is big enough, valid criticism ends up being drowned out by rage based, critical rhetoric that's in a screaming match with proponents.
(The worst part about being hype averse is that I can end up averse to legitimately exciting things.)
It's funny you mention that because I remember at the time of HyperLoop somebody said "what about just ... trains?" and we all scoffed at it as if trains were some outdated technology
Let's just say I'm on team trains now.
Starlink + reusable rockets... alright, not bad, but not exactly a "world changing bet". Seems far more hyped than anything. So he gets credit for just combining the idea of reusable rockets to send satellites into space? okay fine.
He had a lot of money and threw a lot at the wall to see what stuck. If I were a betting man, I'd bet against his "next big idea". He'll over-promise and under-deliver.
Musk didn't originate Tesla's car concept. He did, however, promote into a large scale business. That's the real achievement.
Promotion isn't enough, though. I heard Shai Agassi of Better Place speak once. That was the Israeli guy with the car battery swap startup. He was really good looking, a great speaker, and his 10x growth per year business plan was utter bullshit. Better Place went bust. It wasn't a totally unworkable idea; there are successful battery swap operations in China. But he spent time and money schmoozing with heads of state and setting up demo centers in multiple countries, while not delivering much.
(More fundamental problem: battery swapping is a bet against fast charging and battery progress, which appears to be a losing bet.)
But the people who focus on his successes always seem to downplay, blame-shift and defend when it comes to his negative side. They'll never admit he was wrong about anything. It's the same worship / cult of personality that affects politics too.
We would have been much better off with investment in tried-and-true boring old trains.