The best period of Black music is when black people made music for us, even if it did get mainstream attention later on.
Beyonce's success, isn't going to help Erykah Badu or Jill Scott sell more. But i think slowly it is ushering back genuine RnB into the mainstream, which is can only be a good thing.
I'm good with it as long as it keeps Miley & the other culture vultures out of the spotlight. I'll grit my teeth through all the Drake/ Kanye songs in the world if it keeps Macklemore off the stage.