For GM: I never really saw the reason for having Pontiac. After Oldsmobile was shut down, I never really saw how Pontiac had any reason to stay operational as well. Buick will still be around. GMC will probably be scaled back, if not shut down. Saturn will remain, or at least the products will remain. I don't know what will happen to Saab.
For Ford: They already shed quite a bit with the sale of Jaguar and Land Rover. They hold small onwership in Mazda and Aston Martin, though I could see them shedding one of them if money gets tight. Volvo might be sold off. Lincoln will stay but I'm not sure about Mercury. It could go either way with that brand.

