Is it?
Depends on what you consider to be Hip Hop...
On camercial Radio, yes cause the music is given to you whether you want to listen or not. And in some cases that's what people want to hear anyway. This is just my oppinion. When I'm waiting for the city bus I'm able to hear what people are playing in their cars and a great deal of it is the same music that's played on the radeo.
As far as underground hip hop it's here and alive you just have to look for it and in some cases it will come to you. But as far as it being a house hold name, to me, it's personal choice.
Peace!