Extremely valid economic reasons with no holes.

Pubs shutting down at an alarming rate over a long period of time, somewhat accelerated more recently.

Pubs turning to more lucrative usage of the space due to economic pressure.

Austerity has steadily accelerated since Thatcher's day.

Cheaper to go online and watch clips of favourite performers.

Increasing fuel and transport costs deterring going any distance for a night out at a club.

Folk club necessarily has door charge unlike session/singaround so these options preferred.

etc. etc. yes I know, yawn, excuses, excuses.....