"ie traditional and contemporary folk song and music have survived and prospered"
If you’re talking about ‘contemporary fol songs’ based on traditional styles – no problem – I’d lose a third of mr repertoire if I lost those
SA little different from the offering from the BBC’s ‘glittering prizes’ offerings which have little or anything to do with folk songs   

Bad clubs and poor performances played a part in the disappearance of clubs, but I have equally walked out of poorly performed diverse, non-folk material because it was bad and because it was not what I had been told it was - two for the price of one.
I wish I had a pound for every time I’d been embarrasses bus some inept singer mumbling introspection into his armpit and butchering the tune on his out of tune guitar
It doesn't matter how varied singing is if it is crappily executed
We ran workshops to help new singers and thereby, improve the standards of our clubs

If you are suggesting that traditional clubs = bad nights or are unable to provide a variety - not my experience, I'm afraid
The traditional repertoire is wide and extremely varied enough not to try to please all of the people all of the time
I don't wish to sit and listen to badly or well performed Buddy Holly or Ed Sheeran songs, any more than I suspect those who do want to listen to Joe Heaney or the Stewarts songs - try to please everybody and you end up pleasing nobody - even if you hijack the term "folk" to draw your audience in - diff'rent strokes for diff'rent blokes and blokesses every time
Jim