Tom Bliss, you are making life very complicated for yourself. Your suggestion that the old fogeys should retreat from the outer walls of "folk" and hid in the inner keep of "traditional" makes a sort of sense, but you blow it all by saying, apropos of the word "traditional":
"Yes. That's precisely why we use it. Because unlike 'folk' it's not been eroded. Yet."

Now, maybe I've got a longer memory than you Tom, but I remember well a couple of years back you were definitely a powerful member of the anti-Smoothops brigade, because of the classification of Seth Lakeman's White Hare as a "traditional folk song". And if that isn't an erosion of the word traditional, I don't know what is. The trouble with giving up your frontline and making a tactical retreat is that your new front line can become very shortly just like the old one: breached. Or, as Kipling put it in another way, once you have payed them the Danegeld, you never get rid of the Dane.