Rocky is more worried about what he has on in a video. His first single(can't get to the name) Was grimy but he a fashion nut. So when you want to talk about "new comers" in the world or mainstream rap, you have to mention my doe Kendrick Lamar. Changing the game and imo reviving the mainstream.
As far as the term "Gangsta rap" goes...It has to be the most misinterpreted words in Hip Hop(and there are millions) 50cent can be classified as "Gangsta Rap"..MAYBE. if you look into the unpopular tracks on each one of his albums. The singles are normally what people wanna hear but not who the artist is, club or females.
and HIP HOP is NOT dead! It's alive and well. It just moved to the underground for good.
If you want REAL hip hop. take a look at dudes like Immortal Technique, Diabolic, Kid Sin, Vinnie Paz, Celph Titled, Jedi Mind tricks, Army Of The Pharaohs etc.
My 2 cents