Au contraire! I'd rather have a race in the US to showcase F1 and sorta educate the American public and that way nibble away on the Bushite retro mentality - we've started already with the election of Obama. Let''s keep pushing!
I agree, also with the two locations - the so-called 'heartland' seems to be lost to redneck nasticar for the foreseeable future...
Maybe right-turns are too complex for them? 
Typical NASCAR fans just don't get F1 and they probably never will. I've discussed racing with several at work and it just escapes their grasp. Americans are all about spectacle, so they like their racing to be no more complex than a cluster of forty-some cars packed closely together moving at full speed at all times. They don't want to see cars spreading out and they don't want to see them slowing down for anything. If the pack thins out or if you force them to slow down (F1 has plenty of deceleration), they're bored. The two motorsports sit at exact opposite ends of a racing spectrum with so little in common that NASCAR fans are reluctant to even acknowledge F1 as real racing.
Further, Americans like things that are American, and are pretty stubborn about things born elsewhere. We reject the world's football, because we didn't create it, and instead prefer American football, which oddly enough involves little contact between foot and ball. Americans don't want foreign automotive manufacturers dominating their motorsports, they don't want non-American drivers dominating their races, and they probably won't go for a motorsport that would almost entirely take place outside the US.
It might help a bit if we could get that US Grand Prix Engineering team going somewhere, but the team would probably have to do pretty well to get Americans to really take notice and take an interest in a non-American motorsport.
