Of course anything can happen in the long run, but right now it sells products that millions of people love and is a public company that employs 1000s of people — that's already a pretty high bar to me!
It’s probably safe to assume the truth is mundane. Tesla stock is definitely overvalued (at least it was a few months ago. I haven’t checked recently) and the Tesla brand will likely just become a staple car brand (ala Honda, GM, Ford, Toyota, etc).