Yes, but that's the first layer. The second layer is "Why would we care about undercutting local dealers"? And there are good reasons to avoid undercutting, not just greed, as is often the case.
In my view if the local dealers will go to hell in a hand basket I won’t shed a tear. Michael’s Subaru of Bellevue couldn’t tighten some gasket under the car and my car was leaking oil after the oil change. When I took the car to the dealership they said it was because of my car being too old (older Subarus have indeed a problem with oil leaks). The guy behind the counter looked like he had anger management problems with my request to take another look. So yeah, if Amazon will put these dealerships out of business - good riddance.
You know, sometimes they get anger management issues after the 1000th angry customer asking them to fix what appears to be a design flaw in the car that customer bought. I'm not sure that buying from that dealership via amazon would do anything for you (amazon is just listing dealer cars), or that the situation would be better if you bought directly from the manufacturer.
I think Ford would be happy to sell a car direct and pocket at least some of the commission they otherwise pay to the dealership. But they sort of need dealers also, to do local marketing, help customers who want hand-holding, and to provide warranty/recall service.
