This is gonna piss a lot of people off but falk it here I go:
Sports would be a lot less popular today without African Americans
For the same reason hip hop is so popular with white folks, the mythical like appearance of black athletes to white suburbia, and that fascination with their background and unique set of physical abilities. The fact that your average white man cant be Shaq makes him all the more intriguing.
basketball would be a purists niche sport like it was during segregation where groups of men got together and executed plays.
football would be more tough than speed
hockey would be king
baseball would be the 'sexy' game with its latin flair