Sooner or later, Tesla is going to run out of buyers who want to pay $50,000 + for an electric car. That may be soon when the federal and state energy credits disappear. For $50K, I can buy a new Camry and a nice sailboat to tow.
One thing that is not mentioned often is the lack of repair facilities for these cars, and BS me on they don't need repairs or maintenance baloney. They are machines and have thousands of parts that are subject to failure. This will come back to bite Tesla as more of these cars are on the road. Lack of brick and mortar dealer/repair facilities will be a problem.
You are correct that the market for $50,000 cars is limited. It is known as the luxury car market. That is why Tesla is working to get the cost of a basic Model 3 down to $35,000 in the short-term. Going lower than that will just take time and scale.
Early personal computers were also only for the well-to-do. The trend, as with EVs, was for better and cheaper computers every year. If you think EV's will never get cheaper than $50,000, then I understand being hesitant. That does not seem to be the trend, in my view.
The lack of repair facilities is known, but not insurmountable by any means. Car mechanics will need to shift to EV repair as the market continues to shift. Not all service will need to be provided by Tesla going forward.
It takes time to pull all of this together. As an investor, I am less concerned with the current status than the projected status going forward.