Mike, what you say is true,however there were others who ran folk clubs week in and week out some for over 50 years,whose importance wshould be acknowledged.
The direction of the uk folk revival was propelled by MacColl and Lloyd[ [at last this is being acknowleged,in the past Jim has tried to give the impression that MacColls influence went no further than the singers club    well considering they were both communists , i find it interesting, that the revival was to SOME EXTENT propelled towards traditional music,and to some extent away from political social comment, of course Ewan contiued to sing social comment songs as well as tradtional material
PARADOXICALLY a rule was encouraged at the singers club which in effect meant that unless you were american you could not sing Woody Guthrie songs.
There are two possible conclusions here the first one was that at some point Ewan and Berts influence lessened and the uk folk revival was steered in a more esoteric direction BY OTHERS., and more latterly in a commercial direction with much of the hype that is reminscent of the pop world