More or less wrote what Jon said before the elctro-mechanical brain dropped the line and lost it. Punk was as participatory as folk in its own way and matched it for anti-establishment fervour and simplicity.
I'm caught in the middle - miss the old farmer's pubs of the 70s where singalongs of traditional stuff would just begin unprompted - but see folk revival as the bourgeois, genteel activity it has become.