I'm exactly in the demographic that article mentioned (young white guys) but does that mean I shouldn't be able to enjoy classic hip hop? I actually enjoy the golden era hip hop, I don't really care if anyone says that I didn't grow up in that area/context and shouldn't be allowed to enjoy it, the production lyricism of some older MCs is what what I admire.
They didn't make that shit so only "black people from that era" could enjoy it, it's for every one to take in and appreciate it. I think it was A Tribe Called Quest that said something along the lines of"we do this hip hop shit for everyone, black, white, asian or sicilian". I know my lyrics are off base here but is was something to that effect, and they were right. I'll agree that "Hip Hop" these days sucks ass, but saying that you have to be of that era to enjoy the classic hip hop is complete bullshit. If that's what they were thinking then hip hop would truly be DEAD.
As for what happened to hip hop, I'll agree that money and commercialism got to most of the them. Look at Mobb Deep, they went from "The Infamous" to fuckin' G-Unit records. And Nas, from Illmatic to..I don't even know. Most of his shit after "it was written" is mediocre and mainstream as fuck. The only new age rapper that hasn't got caught up in that bullshit seems to be Lupe Fiasco (IMO) but we'll see what happens.
Sorry for the long post, but hip hop is one of the only things I'm really passionate about. I could go on much longer but I'll stop...here!