And it also assumes that skill in the (relatively) low volume production of rockets can be transferred to mass production of cars.
If Model 3 is not a success money runs out. There will be large changes in the ownership. Musk might sell Tesla to some other manufacturer etc.
The Semi is a huge market.
And even if Model 3 didn’t exist and Tesla pushed itself as developing Model S as the number one car for self driving mobility services, they’d still have a claim at the lions share of the automotive market. Vehicle cost is a much smaller concern in the post-self-driving world.
Let’s imagine Model 3 only pulls Model S numbers, and their annual production only goes to 200k by 2020. I don’t think that’s enough to see a total collapse of the stock the way you seem to be suggesting.
I think Elon has many more cards in play than you let on.
I have yet to see any financial analysis based on Tesla financial that don't see Model 3 as a critical.
Not sure if Musk will be actually making any decisions here when things go south.