I"m having a hard time with this Netflix comparison for 2 major reasons. The first is that Netflix was disrupting an industry that was entrenched and people hated... Cable Companies, who were slow to adapt and inefficient. Netflix was cheaper and far more convenient, and if like me you were a cord-cutter (which I did in 2009) you were saving a ton of money too.
Now your point about them being crushed if Apple and others had competed is interesting, but doesn't ring true. Apple was already competing with iTunes, which has been around longer, but I take your point that serious streaming didn't compete until later. Hulu aside, HBO, Prime and others came much later. But here's the major difference with Tesla: most people who subscribe to Netflix, also subscribe to other services - and Netflix simply retained its lead through a) a rapidly growing market and b) not really losing market share. This isn't a zero sum game - I have Hulu, CBS, Netflix, HBO and still occasionally rent from Apple, or use FuboTV for live sports. They can co-exist. Netflix stayed ahead of the pack by producing its own content, and avoiding being a simple utility of entertainment.
Regardless of that, the one thing everyone knew for sure is that they didn't want to get streaming from their regular cable provider. The whole point was to escape them.
Now in the car world, things are different in those key ways - market share is a zero sum game here, and it's likely the EV market size will grow more slowly than the EV market diversity. That didn't happen in streaming. Also people don't necessarily hate current car manufacturers. Honda fans would love to see a Honda EV. Even the much maligned VW group has people who can't wait to get a VW EV. Personally I would love to see a VW Camper Van EV... if one came out, I'd almost certainly buy it.
So while I don't think Tesla is going to fail, I don't see the Netflix story as being relevant to explaining why they will succeed, just because there are parallels in the stock price.