I agree that the American car manufacturers have made tremendous progress in quality lately, in some cases out performing Toyota in the last 2-3 years, but they ahve 2 major jurdles to overcome:
1) Reputation for poor quality junk that continues to haunt them, and
2) A dealer network that, for the most part, refuses to embrace modern sales concepts.
The 2nd issue to me will be even harder to overcome than the 1st. Even if I wanted a new American car I shudder at the mere thought of having to deal with a dealer network that is still stuck in the 50's. I just hate dealing with high-pressure car salesmen that want to make a guessing game out of the real price of the car. To me the difference in how car dealerships are run is the biggest difference between American and foreign makes.
EDIT: I have made it a rule to not play the game. When I first walk into the showroom I ask for the best cash price that they can give me, and tell them up front that if they are too high I will walk out. I have actually had several dealers quote the window sticker price, and I waled out and let their jaws dropping.