I think the biggest problem is 20th century heads think "the next big thing" is going to be advertised with neon signs and be on the radio 24/7, when a) that's a romanticized vision of the 20th century--'iconic music' from the 60's and 70's is the creme that's floated to the top through decades of review, actually tuning into radios back then would be a lot less pleasant and uniform than the nostalgic expect, and b) we don't even listen to fucking radio anymore, jesus, movers and shakers in music have been online for a long time, even before streaming was ubiquitous.