Even before the gas crisis, imports were cutting into SUV sales in large numbers, and causing money shortages within the domestics. It seems at least GM was trying to branch out, but it is difficult when you start in a hole to begin with compared to your competition. But you also saw negotiations with the UAW to help correct some of this. I think it was too little too late, but I do believe that if they survive, they will be much better for it.
The last car I bought that was US made was the '97 Grand Cherokee, and it was pretty decent up until the warranty expired, then it proceeded to expire itself at an alarming rate. I think Colin Chapman must have designed it!
Anyway, the point is, they have to put memories like this out of the consumer's mind, and I think one way to do is that they have to go through a complete restructuring, and then actually build good cars that people WANT to buy.
Again, I think GM was on the right track, and maybe Ford as well. MB killed off Chrysler I think in the long run, it's going to take a miracle for them to survive in tack I believe.
As for Toyota, I think they still build good cars, but most are just boring, and the quality is slipping too. My wife's Camry is an appliance to the end, but the materials are light years better than most other cars in the same price range, especially compared to US cars. Many don't take into account how long the interiors of some cars will last compared to others, and US cars always try to cut corners here.