>Maybe without the government forcing the manufacturers to go through 3rd party dealerships, they would still use them, but how about removing the laws and see?
I actually read a pretty good reason not to remove these laws a while ago (and it is tangential to the argument about pricing that I made a while ago): It is impossible for independent resellers to compete with the manufacturer. This actually happened with Teslas: when Tesla dramatically lowered its prices to get more money, it effectively destroyed the used market and took money out of the pockets of anyone else who had used (or even basically new) inventory.
This kind of thing happens with other products too. For example, you usually can't buy a book from a publisher for less than the list price, because they don't want to undercut their distributors who are incurring significant costs to stock the books for them. (I think Amazon also requires companies that sell on Amazon to not undercut them by selling for cheaper elsewhere, despite the fact that their fees are high in some cases and they can even sell stuff for a loss.) I think the equivalent courtesy for car dealers would be that the manufacturer would be forced to pick a price and stick to it, at least at the wholesale level. That way, any independent dealer who does buy inventory can be assured that they won't face huge losses if the prices are cut upstream.
Finally I guess there is the question: do we really need the independent dealers, if the risk is all about the manufacturer cutting prices? We do, because these dealers make the market more efficient. That competition means you can shop for the best price or time window when buying or selling, without using Craigslist or classified ads. Dramatic decreases in price also affect owners and finance companies (in case of default). If the manufacturer can just decide "Hey we need to pump out a Porsche for everyone in the world" then they won't be worth what the original buyers paid, and they might walk away from the loan to buy a new one for half the price.