> McDonalds doesn't need any arrangement like that because nobody's interested in mail-ordering cheeseburgers from them
Mail-order isn't the issue. McDonalds can own their own restaurants right now if they want to, instead of franchising. This is similar to how Tesla wants to operate.
> If the manufacturers sell direct-to-consumer, then they can always undercut dealerships...there will be no profit in buying new vehicles to resell on a lot. There either won't be "new car" dealerships anymore, or they'll essentially become showrooms earning a small commission referring orders to the manufacturer.
Good? If they can't add value and only exist because a law creates a cartel, then good riddance. If they actually add value, I'm sure we'll see that represented by people choosing to buy through dealers anyway.
> The dealers have no contracts prohibiting manufacturers from selling direct-to-consumer, and they have no leverage to get them to sign such contracts.
If they have no leverage, why is it acceptable to force them via the law? They could draw up fair contracts where both parties are happy and if they aren't they can walk away from it. It sounds like you are saying it's unfair because the dealers don't have to worry about the value they add to the manufacturers. You readily admit that the current arrangement is inefficient.