There are less black people in America compared to whites (and now Hispanics). So even if you had accurate and equal representation, we would at best be 1 out of 10.
That said, I've always believed their are levels to this racism shyt. EVERY person has some level of bias for or against SOMETHING and that's ok, I don't consider that racist. What's racist is when you let you biases completely control your judgment and decision making. Then there is a shaky middle grey area.
As it goes with wrestling, it started out in America white city and rural areas, by white men. Something about the industry attracts non-forward thinking people but when your industry was created by rednecks, there is gonna be a lack of diversity present. That culture has continued throughout the history of wrestling (and America) and probably not change until the overall demographic of the country changes. And for all the jokes, I really don't feel Vince or the WWE is racist, I DO think they have a tendency to err towards more white performers and cater to appeal to things in white American culture FIRST. Part of that is because Vince and ALL of upper management are white and probably don't interact with blacks often that aren't talent, the other part is that the dollar dictates decisions. Rock was clearly a black champion, but his appeal and drawing power was UNDENIABLE, Rock set the tone for what a Black WWE champion has to be or live up to which will be unrivialed, meanwhile we've had white WWE champions such as The Miz, Sheamus, Jack Swagger, JBL and Dolph Zigger. THAT is the bar for white performers in the WWE, and you can't really argue any of those guys were a draw, so what REALLY pushed them to get a shot as champion?