Does the whole "Step Up + 2" franchise address what's the real promblem with Hollywood concerning A-Americans?

I mean this trend is starting to get so popular now in H-wood. The sequel like the previous is an urban film / culture, yet the protagonist and main leading characters are white. Exploit the culture and make a profit. Maybe the female character was suppose to be black, but having a black female lead and two white male love interests was too touchy/taboo for the film makers? I don't know, but i do know this that in Hollywood an urban movie or any movie with 2 leading black characters is considered "A Black Movie" and therefore will not sell well b/c it's only meant to be seen by blacks. But any kind of movie, even if it's clearly an urban film with white leading characters is considered "A Movie" - for the whole family/everyone to see. This is the real reason why the protagonist and main characters are white. It's a strategic American marketing tool to cast them for the roles, no matter how urban the film is. I mean just look at "Hitch" - Will Smith even admitted the obvious.