Regardless, I don't think the car is an apt metaphor here. Cars are an important utility and gatekeeping cars arguably holds society back., art is creative expression, and no one is going hungry because they didn't have $10 for the newest book.
We also have libraries already for this reason, so why not expand on that instead of relinquishing sharing of knowledge to a private corporation?
It makes perfect sense to me that the big carmakers could get together some day and develop a handful of car platforms that all their cars will be built upon. That way they can buy the parts from any number of manufacturers (on-demand!) and save themselves a ton of money.
They kind of already do that, actually =)