Dead simple, Jim. You keep stating, as a fact, that folk clubs no longer present folk music. I, and many others, have refuted that claim and given evidence that at every club we attend, we hear folk music. All you need to do to prove your point is list all these folk clubs that no longer present folk and list the songs. If it is agreed that by a "loose definition" (your term) of folk music, that none of the songs you list are folk songs then your point will be true. If you cannot do this, your point is unproven and as long as you keep making it, I will keep disputing it.

If you were to say, for instance, that at some clubs you would dispute that some of the songs performed were folk songs, I don't think anyone would have an argument with that. But a blanket "folk clubs no longer present folk music" is arrant nonsense.

I challenge you to attend any folk club in the country on any night and come out saying you have heard no folk music. Or, to put it another way, put up or shut up.