" That indicates it is your view or opinion. "
No Dave - I have a long-held consensus and I have the evidence to back up that consensus - what can you offer in return ?

"The bubble burst. "
The bubble burst when the folk boom ended an the music industry lost interest
After that, the folk scene gathered its forces and established itself with its own labels, a plethora of magazines and new writings
It continued until the clubs moved away from folk song and opted for bums on seats
You are entitled to your opinion, of course, but unless to can substantiate that opinion with facts it remains only your opinion

Try this
I have just met you on line and I asked you to describe this folk song I keep hearing about - how would you go about it, or where would you point me to to read the subject up
Feel free to ask me the same question, of course

"It is just the type of folk club that you are referring to has had its day."
So a music that has survived for centuries has "had its day" because a rapidly diminishing bunch of ageing2 folkies no longer find it interesting - how sad (if I for one minute accepted it)
In the interview I quoted from above MacColl, I bridled somewhat when MacColl said
"I used to think that folk song would survive forever, but I have come to believe that it will only die if it falls into the hands of people who don't like it or understand it"
It seems he might have hit the nail squarely on the head

Jim