In the heyday [clubs] attracted regular audiences of 100 plus, with standing room only being the norm. Today most clubs are happy with a regular couple of dozen or so. This is not because people don't want the music, I think it has proven that the Folk Clubs have done their job.

Not sure I entirely agree with the last statement. I think it is maybe more of a case that the clubs have found their niche. What I value about a folk club is its intimacy and you don't get that with an audience of 100 - that scale is more appropriate to a small theatre or concert hall.

I mostly go to singarounds and I think that if you get more than about 20 - 25, it is getting unwieldy.

I agree with Crow Sister when she says

I love singing this stuff unaccompanied - for my own pleasure. And so long as there are 'spit & sawdust' folk sessions where people gather to share music for its own sake

I also think the Snail's last couple of sentences above is spot on.