Wonder what will take its spot because nothing is bubbling with the same underground to mainstream appeal and pretty much everything is influenced by hip hop at the moment anyway.
That and its got to one up rap like it did to rock. That alone seems impossible given how coarse it is so I expect an AI resurgence of dead artists of all genres to fill the void as the new old thing. After that it'll be something from the East which will probably still have its roots in rap/R&B anyway.
That or a new language will come through and change the game...