That won't be anytime soon. Rock n roll was #1 for over 60 years. There's a lot of people today that have not lived when hip hop has not existed. It's what they know. Obama had rappers perform at the white house, and even Trump talked to Kid Rock & Kanye West at the white house. There's college courses on Tupac Shakur and rap as poetry. It's not just influenced music either, hip hop has influenced modern fashion, art, and entertainment in general. There's symphony orchestras doing classical versions of hip hop songs or doing new compositions with a hip hop influence. The Broadway show Hamilton has been really popular and many of Weird Al's later parodies are rap hits and there's things like Epic Rap Battles In History (ERB) that get many millions of views on Youtube. Psy's song Gangnam Style is one of the most viewed videos on Youtube (currently over 3 billion) and that's just the main music video and not all of the other posts of the song which also have millions of views. Psy is rapping in Korean. Snoop Dogg is on a cooking show with Martha Stewart. There's rap in modern rock, heavy metal, country, dance music, gospel, R&B, blues, and other genres. Straight Outta Compton is the highest grossing music biopic ever. Some of the biggest selling artists of the 2000s are Nelly, Eminem, & OutKast. They all have diamond albums (10 million).