I wouldn't worry about it. GM will not go bust. They may reduce in size and sell off certain divisions but thats about it.
Think about it Ford are not better off, Damiler Crysler have major issues. Nissan is totally broke and has been for years. Ford has or had a major stake in Mazda, Mitshibushi have major issues, MG Rover have gone bust. Fiat (who own Ferrari and Maserati) are in major trouble, Lancia only bearly survives.
And I don't think the French are doing too good either on the whole, none of the middle eastern companies are too hot either (Kia, Daewoo (know owned by GM) and several others).
Toyata and the VW Group are quite healthy. And BMW seems to be doing well.