I think it's more that young people now socialise in different ways. My other passion is climbing, and when I was young the best way to meet other climbers was to join a club, and you then benefited from the experience of older members. Now young people avoid clubs, which they perceive as being rule-bound and full of old people, and meet up at climbing walls and on-line. I'm sure it is the same with folk, I see plenty of young people getting involved in sessions, bands and festivals but they don't seem to be interested in my generation's folk clubs, probably because they see them as full of old people who won't like they way they interpret the music.