Let's look at George Mason University, where I've taught in its distinguished Economics Department for 29 years. According to university race/ethnic statistics, its campus consists of: 7 percent blacks, 7 percent Hispanics, 12 percent Asians, 43 percent white and miscellaneous others. If there were true basketball diversity, we would see at least two white players, and one each Asian, Hispanic and black on the starting five. I don't watch GMU basketball, and have no idea of whether our starting five looks like America, but I'd bet the rent money that our Office of Equity and Diversity has failed at producing basketball diversity.
You say, "Williams, the reason blacks dominate basketball and football is that they are better than whites." Careful! That's an attitude that could win you a charge of racism. It differs little from suggesting that the reason why not many blacks are nuclear physicists is because they are not as good as whites. It should be remembered that diversity creed holds that we are all equal and would be proportionately represented by race across all activities but for the fact of discrimination and oppression.
Basketball, football and nuclear physics aren't the only areas of our lives sorely lacking diversity and proportional representation. American men are struck by lightning six times as often as American women. Men are about 54 percent of the labor force but suffer more than 90 percent of job-related deaths. Cervical cancer rates are five times higher among Vietnamese women in the U.S. than among white women. Pima Indians of Arizona have the highest diabetes rates in the world. Prostate cancer is nearly twice as common among black men as white men. Half of all Mexican wives are married in their teens while only 10 percent of Japanese wives are married that early.
These and many other statistics about racial differences suggests that there will be full employment for people in the diversity business for decades to come.