There is also the potential taxi and trucking businesses if they ever nail self driving. These side businesses are what a lot of people are missing in the comments only talking about Tesla's car business. They are diversifying in a way that some other car companies aren't. I'm not 100% sure that the self driving tech will get where it needs to be for this to become viable anytime soon, but the same applies to Uber and they have a market cap near $60 billion largely based off that same upside.