My take is the current generation (and past generation) doesn't know any different."much of "new" music is crap and has, predictability, lost a ton of interest..." because radio can't run a huge percentage of current hits due to lyrics. Or if they do, and edit, the songs sound awful. So that whole group does not listen to radio... but to them, the current new music is just as good as the new songs in the 50's and 60's were to me.
Recently I made a mix of 50's-early 60's Doo Wop/Pop (pre British Invasion) for my 12 year old granddaughter. She had obviously never heard virtually any of these songs before nor had a small collection of her female buddies. I gave it to them to use at a recent birthday party/sleepover (not at my house). The host parents told me later the kids stayed up most of the night listening to the songs over and over again and I've had requests to make copies. Two sets of parents also said they had not heard most of the songs either but really liked the selections as well. The 'Goldmine' just got 4 new listeners.
I asked my GD what they liked most about the music and she told me (1) lack of "bad" language and (2) lyrics they could understand.
I told her when she is ready to hit the dance circuit I will cut a Swing music mix to add to the 50's sock hop hits. Once the kids hear it they seem to love it as much as we did way back when.