I don't see how he is derailing the thread since the thread starter later writes that he wants American cars in the movie so they can be of some socio-political economical agenda.
The truth is the American car industry has no else to blame but itself for it's downfall. In the 70s they laughed a the Japanese cars. In the 80s they became so obsessed with providing soccer moms with Minivans that they failed to see the Japanese market pulling the rug under them with better, more gas efficient, and economical cars. They scoffed that Lexus, Infiniti, and Acura were never going to overtake the market. Then in the 90s they started catering to the "I want a car as big as a tank" crowd and killed any chance of making more fuel-efficient cars.
Now that gas is quickly approaching $5 here in the US and that people are returning their tanks en masse, they start once again making bad quality cars assembled in Mexico and South America. Or do you guys think the majority of "American" cars are still made in the US?
I for one don't mind the a foreign cars in alt mode, like an Italian muscle cars that can *actually* handle corners and look more aesthetically pleasing to the eye. I'm happy I've heard reports that there's an Audi RS8 at the PA set.
In the end, this should be about having cars that make a good business decision and have good looking cars. I don't want cars for the sake of pushing more American made cars (which there hardly aren't any as most of them are made internationally) to the public or little Smart cars to send out a Green message.