I'm confused. I'm no fan of car dealers, but exactly how will eliminating dealers eliminate excess inventory? The dealers don't create excess inventory, the manufacturers do (and consumers who expect to walk in and buy the exact car they want). Even if the manufacturers owned all of retail outlets, the excess cars they build would still have to sit somewhere, and would still cost money.
If they went to more of a build to order model it would. It would likely be a hybrid system with some cars there on the 'lot' ready to go but custom cars would be ready in weeks. People aren't used to that model though.