g8 and astra are competitive for the most part, they just don't get much in terms of marketing. they seem to get pretty good reviews for the most part.
basically where GM seems like it may go or needs to go
chevy- premier value brand (volume) trucks, small cars, mid size, value priced cars, crossovers, vans, etc.
i would get the dealer network to merge Chevy with BPG. then pontiacs have 3-5 models, rwd all of that. Buick the same. Basically Buick and Pontiac become higher priced support to round out the Chevy line. GMC becomes luxury versions of the chevy trucks and crossovers.
Cadillac is its own dog, but may be combined with either Saturn / Saab / Hummer / Chevy BPG where they can make a difference.
Saturn is left to its own devices. It may coexist separately with ChevyBPG where needed. I would experiment with Saturn and Saab together and see if that can do anything for Saab.
If GM can't revive hummer in a new direction then i am ok with them being sold. Saab I think just needs a new philosophy, positioning, and pricing and NA business model. Let's see how the next 9-5 and 9-4x pan out before we pass judgement.
I would change the Saturn logo to be Opel logo. Screw it, if they are going to sell Opels then make the badge the same. Basically Opel=Saturn mostly. Saturn and Chevy may badge engineer a couple things.
At this point Buick and Pontiac if to continue should evolve into step up products from Chevy that can coexist in that showroom. For example, no G3 or G5 unless there is a substantive difference. For example, the Pontiac should have the unique turbo and unique interior. The g6 should be alpha RWD. G8 would be RWD. The park avenue would anchor the buick lineup as a luxury alternative to the G8. Likewise there would be an alpha buick. I would consider one front drive buick sedan product (lucerne equivalent). I would still be skeptical as to whether there is benefit to any buick or pontiac that is a compact. I would give buick a 2 door hardtop convertible. Pontiac, the roadster. Pontiac a couple of coupes maybe. Chevy IMO does not need a coupe of any sort. as far as crossovers in the chevy BPG combo, it may be tough.
After this Saturn is clear to evolve as Opel does. Then, if Saturn fails, cut the cord....but at least you still need to sell opels so......
ultimately with GM now we have GME and GMDAT which will seem to turn out most of the world product. GMAU and GMNA will be the ones with the most noncompliant world order markets.
AU i can see acquiescing to the other world models with the exception of the commodore and ute being popular there.
GMNA will continue to crank out trucks but really most of NA's product mix will have to mirror the world offerings sooner rather than later. Its why the Aura decision vs. the Insignia is such a head scratcher, even if Aura sales are up now.
IMO it may make sense for GM to consider moving Caddy's HQ and major base to Europe if they really are serious about taking the brand worldwide. Get caddy out of detroit where it is subject to poisonous business culture.