My daughter (when she was fifteen in 1995) introduced me to the following traditional songs. The Bonnie Earl O' Moray, The Twa Corbies, High Barbary, The Burning of Auchindoun. I am sure there were many others.   

These she learned from Society of Creative Anachronism bards as she went with her high school SCA group to events around Virginia and North Carolina. She later became an apprentice to a bard while she studied vocal performance at university.

I have no doubt that to this day she would still be learning and performing "folk" were she still alive. I like to think she still is learning and performing it somewhere.

Her younger sister (now 25, who also was part of the SCA in high school) will tolerate the genre in certain settings, but it makes her remember singing with her older sister and so I think she mostly avoids it.

The SCA still attracts members so the music will continue in that vein. I understand that LARP also boasts some singers of trad song.

May help if celebrities get involved as with this
http://news.bbc.co.uk/today/hi/today/newsid_7521000/7521051.stm