I like this, and think it is insightful, but I am a fairly doubtful that Tesla will show a profit in 2018, or even in 2020. What makes you think that they won't just keep ramping up investments in multiple new gigafactories, Semi production lines, Model Y production lines, etc? If the Model 3 manufacturing gets rolling, and things are looking good, the amount of credit they would have access to would be sufficient to keep growing at crazy pace while remaining unprofitable for years. As long as they were executing reasonably well, I don't think there would be that much pressure from shareholders, and I don't see Elon saying "Lets slow down to get profitable." I feel like he even hinted at this a couple conference calls ago, when he was talking about the spending being within their control, and choosing to grow fast, or Ludicrous. The upside is if they never show a profit, us shareholders will be less likely to demand it. It will give them a big advantage over their competition, who's shareholders would never stand for them canceling the dividend, and loosing money for the next 5 years on purpose to compete with Tesla. If Tesla can get big enough so that they are materially cutting into the competitors profits, along with being able to invest a much higher percentage of revenue, it could turn into a very powerful moat for Tesla. I think Tesla will be able to get away with not being profitable, and will not be punished by the market, largely because there are tons of investors (
LIKE ME) who looked at Amazon for years but never bought it because "They aren't making any money." Everybody (me) is fighting the last war, and has sworn that they will not make that mistake again.
I feel like the examples you gave above of the FANG stocks are largely fundamentally different in that they are mostly software based. The dynamic of discovering a larger than expected market, and capitalizing on that market works much better with software, where you can make unlimited almost free copies, than it does with large manufactured goods. As you said above, it took Amazon getting into software with AWS for the stock to go crazy. Elon is right that the machine that builds the machine is the key to it all. With out it, they will never be able to profitably capitalize on the huge market they have waiting for their Tesla's.
I am only half joking when I leave you with this. We might have to wait until the distributed power system, and supercharger network, is built out on Mars before we see any profits out of Tesla.