I mean, I know what it's like to have "tourists" invading your space after some trend blows up, but there could very much be a new wave of people who have grown to love or enjoy a sea shanty or two now. If people aren't introduced to something, how would they ever know they like it?

If a person liked a venre enough to make a playlist, I'd say they're enough of a fan. It's like people who are discovering the fun in "classical" (baroque, classical, romantic, etc.) music.