the reason they arent getting rid of GMC is because regardless of sales, they have a really high profit margin... all the engineering for the truck is done, it costs the same to stamp out a different shape fender and quarter panel than a chevy, just like it costs the same to stamp out a different shape interior panel.... obviously the materials are a little better and a little more leather used, but its nowhere near the premium the customer pays in the end. As far as the motor goes, do you really think the 6.2 costs much more to produce than the 5.3? hell no! its just some different machining to the same slug that gets poured at some factory. they obviously make good money with the luxary SUV and pick-em-up so let it slide.
Buicks sell like hotcakes , but i agree with whoever said earlier that they are getting too complicated... they need a "budget" buick because honestly 90% of old people dont want bells and whistles, they want 60 series 15" tires and no shocks so it rides on a cloud....