I keep hearing that dealership make the majority of their profits from service. So it stands to reason that some dealership might just opt to drop sales altogether and just be a ford certified service location, or something like that. That's said, I think the problem you would run into is people feel more comfortable with taking the vehicle back to the location they bought it from when it needs service. So in that regard, dealerships need the sales business in order to establish a relationship with customers for service.
If there were no dealers though, then it probably wouldn't be a problem. It becomes sort of a chicken or egg thing. These places don't need new vehicle sales for profit, but being the only dealer that doesn't sell vehicles will hurt the service business. It's almost like they would be secretly happy if Ford ended dealer sales. There isn't really a good way to transition from sales/service to just service.
I think Ford can start a slow transition though. For the higher end vehicles, don't give out dealer allocations. If a dealer can get a customer commitment, then they get in line for a vehicle, a reservation if you will. Or, customers get the reservation from Ford first, then pick your dealer to facilitate the deal. Dealers can still keep 'peasant vehicles' in stock for the vehicles they wouldn't get ADM for anyway. You can get it to the point where a dealer is for service, used cars, and facilitate purchase of new cars (maybe test drive only). Practically become more like a drop ship retailer than anything else. Dealer still gets a cut of the profit, but they become much less of a barrier between Ford and customers.