You brought up about hip-hop music becoming prominent in pop culture.

I'd say that evolved. The culture 'flowed' in that direction. It was an unstoppable change. No one could purposely 'arrange' it otherwise. One could not make, say, big band music become 'all the rage.'

The culture goes where it wants to go.

Same goes for the 'ideal' female body shape for 'sexual attractiveness.' It is what it is. A VERY narrow definition (in every sense of the word). I agree maybe it SHOULDN'T be that way. But it IS that way. Makes no sense. Not based on reality, what's 'normal' or average or realistic, etc. It is what it is. It has changed over time (Marilyn Monroe would be a 'fat chick' now a days) -- and I'm sure it will change in the future. All we can do is sit back + watch.