It really does not matter wether or not young people are going to folk clubs. Its more important that they are getting involved in music of all genres.My 2 sons are both brilliant musicians but claim (tongue in cheek I hope)to have learnt nothing from me or their mum who have both been around the scene for more years than I can count. Both were brought up in a house filled with music and instruments and both came to clubs and festivals when they were young. We still encourage youngsters to get involved and still give the odd lesson.
We spent the last 21 years playing for Hobby Horse Club at Broadstairs festival and count as friends many now well known artists whose first introduction to "Folk Music" was listening to our band at HHC.