What a bizarre move. I don't think someone who buys a Vette or a $75k Cadillac XLR would want the same badge on their car as a minivan, or a riced-out Aveo. I've known a lot of people who liked or owned Saturns but hated GM, not having any idea Saturn is a subsidiary. Ditto with Saab. Typical Chevy/Pontiac/Buick buyers are already perfectly aware that they are GM products. I don't see any benefit in this. Marketing people...
I think their money would be better invested in things like, oh I don't know, making dashboards that don't have the look and feel of Tupperware that was melted in an oven and then spraypainted various mismatching shades of dishwater gray.