Hip-hop has been on the mainstream radar for about 30 years, dude. If Spotify had come out in '90 (that's a "Wonders of the World Wide Web" video begging to be made), you'd have a point. But as it is, for a while in tge early 2000s the Billboard 100 was consistently topped by R&B acts, or as Chris Rock liked to call it, "singing over rap beats".

Where Spotify comes into play is granting exposure to artists who are still trying to make it, or whom mainstream radio won't play. But that's cross-genre and diesn't affect the mainstream viability of hip-hop itself.