I think, just as there are more and more black kids playing in indie rock bands (previously the preserve of the white middle class) we're starting to see more Afro-Americans checking out the music of the past. I have to say, I think it corresponds with the rise of an Afro-American middle class and increasing affluence: for the simple reason that hip-hop and soul sell much much better (playing folk and blues isn't exactly a ticket to fame and riches).
Over here in the UK, there's the one-man-band that is Lewis Floyd Henry. Or Errol Linton. But in the UK, it's different again, as black musical heritage is going to be Afro-Caribbean or African. So reggae and ska and calypso are more likely to be yr interests, not blues.