The value is really in the inept cluelessness of the legacy automakers. If any of them woke up and got a Clue(TM) then, after they build a car that isn't crappy, and a charging network, and self-driving... Then TSLA stock might drop.
Ford has the Mach-E which is getting really favorable press from the “car guy” world (i.e people who are a little more skeptical of Tesla) which supposedly is getting self driving and is $7k less with tax credit than the Model Y.
Honestly, given Tesla’s quality issues and how they address them, I wouldn’t mind seeing what the more risk-averse, mature automakers come up with. The way Tesla has handled design flows in the Model S front suspension is downright disgraceful.
https://www.reuters.com/article/us-tesla-safety-investigatio...
Like I said, its not just the car. You may be right about SuperCruise, I have a small amount of experience with it, but I'm skeptical.
As for cars having design faults and the manufacturer being disgraceful... That's a pretty long list? We could start with the Pinto exploding? Or the Bronco roof collapsing?
(Tesla has a significant lead, but ultimately still has a small number of locations)