OK, my jaded 2c worth....
There hasn't been a top supercross held in this country in a major capital city for a very long time indeed.
The "supercross" that has been served up to us in basketball and tennis stadiums is NOT supercross, it's
arenacross.
Supercrosses held at worn out and shonky speedway venues also do not count...
The reason supercross has captured the imagination in the USA is that the venues are major stadiums, the tracks are decent in length and the number of riders on the gate (usually 20) is substantial. In other words, the racing is the spectacle, supported by the atmosphere that a big crowd creates.
Nothing like that has really happened here since the Sydney Showground supercross where (reportedly) 40,000 showed up to cheer Gally on....
No amount of frigging with the format of supercross, to make it "more entertaining" will substitute good old fashioned large scale spectacle.
Chad and his mates are fooling themselves if they try to do it on the cheap... If Chad decided to run a race at Aussie Stadium, with Bubba and himself riding, then
THAT would bring them in from miles around...including the mainstream press which is vital to bring the sport into the loungerooms of OZ.