That's where GM have been quite clever...
When they cleared the decks, and shut down Pontiac and Oldsmobile, GM integrated the defunct Saab range, including a couple of smart SUVs into the Buick range, and relaunched it at the upper end of the middle class market firmly between Chevrolet and Cadillac.
If I might be so bold...
The future of General Motors.
Rebrand the entire Opel/VX range as Chevrolet, with the exception of the Insignia and Cascadia. These can be marketed as Buicks, (the Insignia platform is already sold as a couple of Buick variations). Can the Antara, (it's only a rebadged Chevrolet Captiva anyway).
Add the full Holden range to the Chevrolet brand, (only the Commodore is an all Aussie product, the rest being a mish mash of Chevrolet and Opel/VX models already).
Chevrolet also produce a wide range of commercial vehicles from pick ups to large vans, so bin the rebadged Renualt van program.
This would leave GM three distinct global brands...
Chevrolet would be the mainstream manufacturer of everything from city cars to large vans, all sold at the same price the world over.
Buick would be the slightly upmarket brand to compete within the executive market.
Cadillac would be the flagship brand.
The key to the whole plan being that every single model would be readily available across the globe at the same price, so a $12000 Chevrolet Spark would cost £8k here, €8.5k in europe and $Aus16k down south. Factories affected could switch to producing either units in regional demand or to take up any excess demand for other regions.
If you want to be fussy, you could consider swapping Buick for Opel, but be realistic, noone outside the UK would choose to buy a Vauxhall branded car, as it will mean nothing to them

The American Brands are synonymous with the American Dream, and recognised the world over. If we were to play word association and I said 'Chevvy', I pretty much guarantee that 95% of you would reply with a V8 related answer
