['97ventureowner]

I'd rather see GMC get dumped and the product line merged with Chevrolet weeding out any duplications. Then GM can go back to it's roots offering Chevrolet as the "starter" brand with a line of vehicles aimed at young people starting out , and families looking for affordable transportation. Then above that Pontiac could fill the need of those who have owned Chevy and are looking for something sportier, and a few more options than Chevys. This line could be aimed at the mid to late 20's up to the mid to late 40's. Buick could fill the need above Pontiac offering a higher "luxury" line of options to meet the needs of those from the late 40s on up. They could offer some models aimed at the lower end of the age demographic and some models aimed at those over 65. Cadillac would be the top of the line for those who want something more than a Buick and those who want a combo of sport and luxury. Their demographics could be those aged 45 and up with a lot of disposable income, and offer a few models spread across the age divisions.
The thing to debate is about which lines would have niche vehicles. I'm talking vehicles like SUVs ,crossovers, trucks, etc. I think we could relegate the trucks to the Chevy line along with SUVs, and offer crossover vehicles ( those that replaced minivans ) to the Chevy and Pontiac lines.It could be that Buick and Cadillac could see one "non car" vehicle, but I think it might be in GM's best interest to keep it simple and cost effective and not try to have too many models or clones spread across all divisions.
Paring down the model count and getting rid of excess duplication could help them save money and use that money toward development of vehicles that the public wants/needs.