They are way too big to fall. They might have a huge fallout, need a govt bail out, restructure, new leadership, etc.. But they will not just fall flat on their faces.
They have a part in way more than just building automobiles to go under.
That's just it... They won't just up and disappear if they go under like many people think... Most of the people who have jobs now will still have jobs, but under a different name. Some restructuring, retooling some plants, a different company name and bam... you're making Hondas.