Jazz didn't die as a Genre, Rock didn't die either...hip hop is not gonna die either.
Jazz is almost 100 years old, Rock and Roll is 70+ years old.
We're almost 4 generations deep of hip hop... and it's embedded into American culture to a point where you can find it everywhere....and spread across the globe.
Grandmaster Flash is almost a senior citizen,and most of the Rappers from the 80's have had kids,and some of them have had kids.
hip hop isn't going anywhere, it's just gonna grow exponentially to the point it's a cultural staple in the rest of the world like it is here.
I'm not talking about in the sense of growing, I mean in the sense of developing its sound as a genre.
Jazz and rock are what they are. They're still the same at their core as they were 40-50 years ago. The technology has brought it along greatly, but it's still the same core sound.
With say R&B, R&B in 1970 is nothing like what it is in 2013. The core sound is gone. Now you have people trying to claim artists like The Weeknd as R&B just because he sings over a mid-tempo production. That doesn't make him R&B. You don't call Portishead R&B and they make similar music to him and Frank Ocean.
Sometimes, a genre changes itself so much that it no longer has the same core as what the music itself is about.