Prior to retiring, I worked on the dry battery electrode development project and what would become the 4680 cells but they weren't called that at the time. The engineers also did a lot of experimentation with pouch cells and prismatic cells but kept coming back to the cylindrical form factor. Elon, in his visions of grandeur once thought that Tesla would manufacture and supply their battery cells to all of the other makers or at least license the technology. Nice idea but he's too busy just making cars than to build a few mega-battery manufacturing plants so some battery-specific manufacturers will pick up that market.
Alarmguy, your argument that one might invest in the lower margin companies due to the fact they will be producing vehicles that are much more simple, require far less of a work force to build, much more modular and much more profitable ignores the fact that Tesla is constantly improving and refining their design and manufacturing processes. The Gigacastings are an example as is their process of applying paint and rust protection. And unless the auto maker unions are broken up, don't ever expect them to allow reduced work forces. Even if the production methods are improved and more automated, they will figure out a way to keep those displaced workers on the payroll. So much for getting their profit margins up above 25%.
Also, never underestimate Elon's ego and the fact that he is the richest man in the world. If one of the other automakers has some kind of breakthough in battery technology or manufacturing methods you can be sure he won't be sitting in a corner pouting about his once great company. He'll put the resources into competing with or even bettering the other's technology.
It reminds me of the scene in Citizen Kane where one of Kane's employees tells him he is losing a million dollars a year on his newspaper. Kane just grins and says "You’re right, I did lose a million dollars last year. I expect to lose a million dollars this year. I expect to lose a million dollars *next* year. You know, Mr. Thatcher, at the rate of a million dollars a year, I’ll have to close this place in… 60 years.”
Elon has F.U. money. And the legacy automakers don't.