I think when Leigh Diffey was really covering road racing events when he was a Speed Channel regular, he was on "WindTunnel with Dave Despain." I think when Mr. Despain asked the Australian about road racing's popularity in the States, I think Mr. Diffey said that it would be impossible for road racing to at or above NASCAR's fanbase. I don't think it's possible, even though I love the biggest road race in the world- the Le Mans 24 Hours.
In order for road racing to completely explode in America, millions of racing fans will have to find a way to be convinced that road racing is better than NASCAR. In the mainstream, you'll keep hearing of American racing fans loving things like your local Saturday night "short track" racing. America's love of racing is about as different as any other place. Europe has great series such as the British Touring Car Championship, Formula 3, GP Series, Deutsche Tourenwagen Meisterschaft (DTM), and even the Le Mans Endurance Series. In America, the majority of racing fans are into World of Outlaws, ASA, USAR Hooter's Pro Cup, Champ Car, Indy Cars, some like Formula One, and let's not forget NASCAR. We are just unique with our racing as much as Australia's wonderful Australian V8 Supercar Series. The majority of racing fans you'll see in America who like road racing are mostly the underground, non-mainstream types like on these message boards. In my message board experience, this is about the friendliest message board I've been on in which hating on NASCAR doesn't really get you into any trouble.
Somehow, NASCAR overshadows all kinds of racing in America and around the world. Some will say that the kind of sideways action on "dirt" tracks and close stock car race deals far exceed anything in Europe or Japan. In order for the fanbase to exceed or meet NASCAR's will take a lot of work. A WHOLE lot of work. I love the American Le Mans Series, as it's perhaps one of the best racing series attracting all sorts of talent around the world. Porsche's going to race later this year and full-time next year. Mazda got its first LMP2 win at Mid-Ohio. The ALMS won it all at Le Mans this year. Still, people would rather see NASCAR or something that's oval racing. To me, I'd rather watch the ALMS than Grand-Am, simply for the international appeal and tough challenge. Seemingly, more people would see Grand-Am or NASCAR. It will be tough to draw America to road racing.