I think it's a trend....multi franchise dealers aren't popular with manufacturers.
Triumph have a further problem in that they don't just make cruisers.....so that it's hard for them to make a shop which will appeal to such disparate buyers as classic fans, sports bike fans and cruiser fans.
Also I'm aware that I tend to know more about the bikes the shop is selling than do most of the children they employ in their shops...this is not confidence inspiring