You guys make some good points. The issue is complex and includes cultural as well as economic factors. Some of the key issues as I see it include:
1) US sports infrastructure (news media etc) is ball (or puck) focused. Any other competitive sports are generally viewed as sideshows. This includes all motorsports (including, until recently, NASCAR), skiing, bicycling, track and field, tournament fishing, skeet shooting etc.
2) Competition with major team sports that have natural constituencies. For example, the pro teams in or near your city, college teams from your region or where you attended.
3) For some reason, in the US, roadracing, on 2 wheels or 4, has not had much appeal across socioeconomic lines. Oval track racing -- NASCAR, modifieds, flat track etc, as well as drag racing, all have strong blue collar appeal, while roadracing has been more associated with the elite, wine-drinking, brie-eating effete segment of society.
4) As mentioned, having only one round locally (when we DID have any at all), in a country as large as ours, limits exposure. Most European fans I know will attend at least 2-3 rounds per season. Most American fans would not be able to attend one even if it were to be held, due to the distances.
5) Except for possibly one or two of the newest tracks, US tracks do not meet FIM standards. Many riders would refuse to ride at Daytona, for example.
6) Lack of charismatic US talent in the series. This is where I have the most optimism, because that is very different this year compared to the recent past. KRJR is a talented rider and was World Champion, but he is not that likable and is not the best public face for the sport. Riders like Rossi make much better press. Hopper has possibilities, especially if he can get some good finishes and acheive a higher profile. Colin Edwards is always a good interview, and Nicky Hayden is a PR agents wet dream. If these guys can get some good results, and thus get a little air time or print space in the general media, the profile of the sport could be dramatically improved.
BTW, I also would love to see the WRC circuit make a couple of US stops. Aside from motorcycle road racing, that is now my favorite spectator sport.
Regards
Bob