Gman, Sure.
I haven't actually done a 'proper' folk fez as yet this year (despite plans otherwise). Though having been an alt-fez goer in past, I recognise the classic demographic of fezzy goers.

I suspect, unless something radically alters in the near future, that the traditional 'folk club with guest', or indeed the 'amateur folk circle' which is apparently superceding it, will indeed die out in a matter of a bare smattering of decades.

Which I feel is actually rather a shame.
For I have a real fond spot for the classic 60's politically activist, liberal Guardian reading, educated working-class, folk revival generation. They are a unique breed peculiar to the particular social, political and intellectual ferment that birthed them, and I personally think we will be far the worse without them: pewter tankards, brown leather sandals, naive social idealism, panchromatic trousers and all.