Some of this was foreseen by a number of us , whereby young performers who were coming through , suddenly jumped from being good performers ,to , the concert /festival stage - and duly gave the clubs a wide berth.
In previous "waves", performers were glad to play any and every venue - just to keep playing and , get a night's fee, no matter how large or otherwise. Some performers used to refer to playing at smaller venues for a small fee as "being paid for practising".
At least it turned over some money, and also sold a few records / tapes /or CD's.
Apples will grow , but .....