"Thoughts?"
Well, apart from the fact that none on your list (as far as I can remember from the dim and distant past) bear any resemblence to any folk singer I've ever heard.
The second is in direct response to the orinal question - in the interest of keeping folk music alive (and attracting new blood) what on earth advantage can there be at pointing to a bunch of blasts from the past who would be as alien to them as James Hogg's mother?
Jim Carroll