To the contrary, I think there was some incredibly vibrant and interesting music that emerged in the 80's, roughly coincidental to the onset of MTV. IMHO, music entered a real tailspin in the early 90s, about the time MTV stopped actually playing music videos.
Rock music DIED after the 70s. Music videos are part of that. MTV started it then it was farmed out to other music video channels.
There is something missing in people’s makeup that requires a video input to enjoy music. Music is audio. Some of the best artists back in the day were ugly as sin and never would have made it into the industry had their looks been factored in.