GM needs to get off their asses once the crisis is over a build a museum. It's great that they have those cars, but not when the general public can't see them. Having a place that could generate revenue to keep the collection up keeps the colllection intact. Then they wouldn't have had to sell some of the '50's dream cars they made (and sold at B/J).
Chrysler has the Walter P. Chrysler Museum with a large part of the rotating collection housed at another facility. It's also where they handle any restoration that needs to be done. Ford does have the Henry Ford Museum, but they tend to keep show cars and such under corporate watch and then either destroy them or sell them off. WPC, if I remember correctly, gets minimal or less funding from the parent company because it's been able to fund itself.