Quick, go buy a second one for a spare parts car. 
Seriously, what guarantees did you get that spare parts will be available in the future, with Pontiac going under?
Well, the parts thing depends on 2 rumors. First, Holden will continue to make parts because they are still making/selling the car down under. Second, someone on a G8 board is saying that there is some govt regulation that says the car manufacturers aren't allowed to abandon cars and must keep parts available for 7 years. That doesn't mean your local dealer will have the parts, but they should be able to be ordered for 7 years.
There are already companies making money importing holden parts to the US, since GM went cheapo on a few things. Just two examples, they removed the spare tire and jack from the trunk to help the car lose enough weight to fit some EPA standard or another (and to help it beat 5-series BMW on the track), and they did not install a nice looking piece of engine bay trim that fits over the top of the radiator to make the engine bay look a lot cleaner. It's a standard holden part and costs around $30, but pontiac didn't ship G8s with the trim so people have to order it from Australia.
