You can't force a dealer to take on a brand they don't want, and some dealers have non-compete clauses. Ducati has been moving all their dealerships to just Ducati. I'm not sure what the logic is but I'm sure they're thinking it will boost sales. Seems Harley has done this forever so there's probably something to it.
The RE is a niche bike and getting it in next to a bunch of Japanese bikes in a large volume dealer may be tough. I've found that scooter shops have some of the most avid and enthusiastic riders as both customers and riders. This seems to be where bikes like the Enfield, Ural, and all the smaller Chinese/Taiwanese makes get sold. Love it or hate it, it is what it is. In a sense it's a good fit, scooter riders are usually looking for something a bit different too and, at least for now, that's the REs niche.
I'd say other bikes fall into this category too. MV Augusta and Moto Guzzi, though well know, sell relatively few bikes in the States and have their problems with parts supply and service availability. You can get your Ford F150 serviced anywhere and parts are always available. If you drive a Citreon 2CV things are different.
Scott