I don't agree, but I do realize that 70% (or even more) of the people listens to commercial music and is actually feeding the medias.
I listen to a lot of music that can be considered quite underground, black metal, industrial metal, aggrotech, EBM... But I don't consider rap commercial. It isn't, or well, it wasn't used to be in the past. Modern rap is not rap, it just "sounds" like it was.
But that's the usual boring statement you've heard lots of times, isn't it?