Enzl is correct about one thing: GM's slamming dealers against each other is unique in this industry. Just look at the Canadian market, for those who want to see where this could end up. GMC and Pontiac outsell many of their Chevrolet counterparts. Cannablizing Chevrolet for the sake of a few sales elsewhere is not a profitable business plan. GM needs to pick 3 or maybe 4 brands and promote those globally. Spend the money globally.
Of course, GM is between a rock and a hard place. Getting rid of Oldsmobile was an expensive proposition, but the business model does not justify 8 divisions with low-twenties market share. Death by a thousand cuts.
I have friends who are loyal to Chrysler, but will settle for Dodge if that is what they can afford. GM may get a bit of bad press, but over all if 2 or 3 divisions have to go, it will not be the end of the world.