I think what we have with the appointment of "plate glass" dealers is the quandry Morgan finds itself in with their model line-up. Both the trad and the 3-wheeeler suit the enthusiast who is more than keen to live with the character of the car and ownership experience, and would likely prefer the ambiance of the traditional dealer, servive, personal touch etc.
The problem is with the high-end product. It's simply not selling in the nubers Morgan would like. Sure some will sell through trad dealers, but not enough, hence the move to also sell from plate glass dealers who are used to selling Porsche, Ferrari, Lambo etc.
It shouldn't threaten the trad dealers who are far more likely to still be dealers long after the PG dealers have lost interest.