"you know next to SFA about folk music in the 21st Century"

I'm not sure if that's true. It all depends on how we define "folk music".
The "What is folk music?" thing has been done to death on many occasions before. So, the arguments in this thread aren't particularly new.

It's much easier, I think,but still problematic to identify what "traditional music" or a country's indigenous music is.

For me, I'm content to accept that "folk music" covers a multitude of sins and styles of which traditional music and song is just part.

If we wish to insist that clubs should soley focus on traditional music and song, then maybe they should be renamed accordingly? Otherwise, I expect a wide variety of music at folk clubs and festivals which I can either enjoy or choose to ignore.