How do you know this? a world championship event hasn't been tried in the US since the 80's has it? The WTC's at long beach? If you're not even prepared to try, at a less costly venue, you're never going to break into the market. It's been proved the only countries that can sustain large stadium venues are Poland, UK and Denmark. Sweden, Germany, Australia all had large stadium events that ultimately failed before moving back to more modest stadia in the Swedish and German cases.
The risk should have been taken years ago in the States to cash in on Hancock's "star" appeal and capture the imagination of the next generation of US riders, it maybe too late now, a missed opportunity while the organisers were messing around in Finland, Italy, Germany and Latvia