I don't think Hollywood has much influence as far as race mixing goes. Human attraction is a very hard wired process. You can't really manipulate someone into deciding who they want to fuck.
I think race mixing is inevitable once people commingle so you are exposed to people of other races. The only real way to prohibit race mixing IMO is to prohibit people of races from being around each other at all. As long as people of different races are around each other and get along for the most part, there is going to be race mixing.
If Hollywood actually had influence over our mating preferences, all men would be gay or attracted to fat chicks and hot chicks would be attracted to nerdy looking guys. But it doesn't, so good looking people are attracted to each other, and the rest of us figure out our place on the attractiveness scale and stay in our lane. I think Hollywood and the rest of political correctedness crowd would like to be able to manipulate who we are attracted to, but they can't. It is too hardwired. Doesn't matter how many fat "models" they put on the cover of magazines and star in TV shows, I aint ever rubbing one out to any of them.