Having owned a few GMC trucks, I would hate to see them disappear...
plus it is much easier to spell than Chevrolet
From a business standpoint I guess it would be better to consolidate the trucks. I have always preferred the GMC styling cues over the Chevy though......... Even when they shared everything except grills, headlights badges. Never owned a Buick, Saturn, Pontiac, Hummer, so I would not miss any of them, especially if they do not make a new Trans Am.
Keep GMC, maybe just for trucks... no acadia, envoy, suburban copies, put the hummers under the GMC tent.
not sure about the denali