Part of the blame for that has to go to close-minded Black folk who judge and put down other Black folk who dare venture into other music genres, including the genres that (at their fundamental level) were created by Blacks. Especially when those criticisms are nothing more than using a sugar coating to call someone a "c00n" or "oreo."
Quick generic example: Young Black child in the hood picks up guitar, it fits into his hands naturally, he plays a few chords and notes, and receives enjoyment from the music he is creating with an innate flow. His / her friends find out about, crack the customary jokes about playing "White people music," and due to peer pressure, insecurities, and fear of being ostracized, puts the guitar down and calls it a day on a wonderfully discovered natural talent.Those kids who are doing the clowning, more than likely learned that "blinders on" mindset from their own elders.
If we all just stopped pushing judgmental mindsets, maybe we'd see more progress and a take back of the music that was started by our ancestors. However when the first barrier is your own people, how can you expect people (especially young ones) to consistently acquire the strength to defy the stereotypes set against you by your actual oppressors?