I really think China has a lot to do with it. If Tesla is going to sell a lot of EVs anywhere, it’s going to be China (and by a lot I mean the only conceivable market pushing for electric that could possibly justify that market cap).
The bet is they can sell about 4 million cars in China, I think. That can justify the 200 billionish projection.
Toyota sold something like 10 million cars globally in 2019. If Tesla really is the best electric car people want, it should just be a matter of ramping up production.
Edit: My numbers were all based on 200 billion valuation mistakenly, so just double everything.