I'm as baffled as everyone else as to exactly what is required here, and Thomas Stern hasn't yet popped back into this thread to clarify ...

Has anyone seen a written comprehensive evaluation of these and others in this vein?

What other than the collected back issues of English Dance & Song, Living Tradition, fRoots/Folk Roots/Southern Rag, Taplas, Stirrings, all the other regional magazines, several books with 'Folk Revival' in their title, the occasional bit of coverage in the national broadsheets (some of it well informed, some of it not), etc. etc. etc.?

Or are we being asked for a single comprehensive study? I suspect one such will never exist, for all the reasons of opinion, interpretation, and disagreement about scope and definition that are illustrated daily here on Mudcat. The story goes that Sir Walter Raleigh started to write a 'Complete History Of The World' whilst incarcerated in the Tower Of London, but abandoned the project when he realised that he couldn't even get to the definitive truth of the causes of a fight between two workmen he witnessed one morning ...