Point one is valid, but point two: surely if the company dies then the exclusivity feel of your car goes way up, and it becomes more cool not less.
For a discontinued car (or, a car made by a defunct company) to still be drivable, there needs to be a sufficiently large community of enthusiasts around it that have figured out how to fabricate the parts that are no longer available.
Now, this has certainly happened. Lots of cars from the 1920s and on are still on the road, and a cottage industry has sprung up around keeping them running. However, the defining feature of these cars is that a substantial amount were sold.
Getting parts made in the future for a very unusual and technologically advanced car like a Tesla if the company is no longer around is going to be very expensive indeed. It will cross from being a daily driver to being a project car, and the owner will need to be very dedicated to the project.
What fraction of the parts on a car do you think that a 3d printer can produce?
For example, they can't produce any of the electronics. They can't produce any of the load bearing parts. They can't produce any of the sheet metal.
> Heck I'd love for mandatory escrow of every component's 3D models
Lack of 3d models is rarely the problem. (In most cases, you can use an existing part as a template.)
Today? None, or next to none. In 5, 10, 20, 30 years?
As I pointed out, 3D models help with a minor problem, a problem that has other solutions. They can't make much difference.