I don't see a huge implosion happening. What will tank Tesla's stock is when competitors catch up and pass them. Two years ago, Tesla was the only viable option. Today, buyers have a lot of options and with Tesla's continued problems with quality and service, that will mean other makers will continue to capture more market share.

On the autonomous driving side, Waymo and other teams are years ahead of Tesla. Elon's been able to convince the market otherwise and so far they've bought it. In the next 1-2 years as self-driving cars get deployed onto the roads this will be undeniable.

I don't see a big, Theranos style implosion. The market will slowly grow concerned, there will be a "correction" which Tesla stans will ignore and then will be a slow decline with dips each time competitors release strong numbers. By 2023-2024, Tesla's market cap will have fallen 70-80% down to that of other car makers.