it would be nice if you blame one single thing on the demise of the great folk revival - agents, people singing in American accents, rotten floor singers.

if just one thing were responsible, we could put it right - or somebody would have put it right by now.

In a way - all the faults we can all see are the consequence of the terrible fact that is staring us all in the face.
'Folk' as a great artistic movement has run out of steam. As a working concept, it doesn't excite artists of great significancem or audiences.