I hate Musk, and I'm not going to justify Tesla's crazy stock valuation, but consider the following:
Outside of China, Tesla's probably the only company that can compete on battery prices. I don't know how accurate it was, but a news report was comparing the cost the manufacturer's pay to build the battery. Chinese companies were around $6000. Tesla was at $7000. Everyone else was around $12-15K. This is why a number of companies have exited the EV market - they just can't compete. This is why Ford lost money on every EV, despite the high MSRP. This is why the Ford CEO says "We're f####d" when he saw Chinese cars.
The only hope regular Japanese/American/European auto manufacturers have is if EVs do not gain substantial market share.
If the future is EVs, Tesla is the only non-Chinese company that has a chance.
It's depressing.
It's not depressing because it's not true. Tesla isn't investing in battery technology. Tesla also isn't developing new models at the same rate as VW, BMW, Mercedes, Hyundai Kia, etc.
This assumes it is literally impossible for anyone else to reduce their battery costs to a level which makes them competitive with Tesla in an environment when battery prices are falling rapidly and the tech continues to evolve (and Tesla's EVs are not even unusually cheap or experimental in their battery supply chains)
That sounds less likely than the bull case Tesla is trying to make on "we're a robotics company now" or "one day all cars will be autonomous taxis controlled by us".