The thing is, sports these days are far too competitive for wild characters to be successful.
In the past, a talented athlete could skip training, ignore his coaches, and go out partying and still have a good shot at winning. Nowadays, while the wild character is out being "cool," his competitors are doing what it takes to be the best. And when they compete, the "cool" guy's talent alone isn't enough to win.
The perfect example of this is Nick Kyrgios in tennis. He's got the talent to be the best, but he's got the mentality of a teenager whose primary focus is trying to look cool. As a result, he loses a lot and is being overtaken by younger Aussies who are more focused on winning.
The US will have another male racer at the top in the future, but he won't be a "cool" guy like a '70s rock star. Those guys will be the ones regularly finishing in the places no one cares about until their teams cut them.