I think what could potentially be vapor is the money in the valuations. In two years, Tesla went from 75billion market cap to 1 trillion, in the middle of a pandemic. How can a car company, of any kind, suddenly be delivering 925 billion dollars more value to the world. Tesla is one of the biggest car manufacturers by market cap, yet almost every other car company is out-producing them by a landslide, and even as industrial conglomerates they're valued at much less than Tesla which is practically quaint by comparison to say, Toyota's operations.
So valuation comes from speculation of course, but what are people speculating will happen? If Toyota, the biggest car manufacturer in the world, is valued less than Tesla is now, then the end goal of Tesla matching or besting Toyota's operations should see it's real value be... much less than it currently is.
Now incumbent manufacturers are delivering EVs and in brands, form-factors and levels of quality more people can care about, I just don't see how Tesla is differentiated in a way that even remotely justifies it's valuation.