Tesla high valuation is the only thing that has prevented it getting bought by one of the big car companies, and that's a good thing. GM used to buy smaller competitors to take them off the market and just keep the name as a token of the brand. Hundreds of players from the first half of the 20th century got swallowed into a few brands.

Tesla has pushed the car industry forward decades in a few years. The big players were just competing in price and size of vehicles and never taking risks. Elon Musk has the vision and charisma to execute and move Tesla to the forefront of innovation, keeping everybody else in its toes trying to catch up. I don't think the market cap will fall anytime soon for this company.