Largely it's about going back and picking up on good things that have been discarded unjustly by a "music" industry obsessed with novelty, and change, because that's how you make money. And then it gets dusted down, and given another chance.
And since it is live music, it continues to develop, in accordance with its own nature and the needs and tastes of the people in the folk world. Essentially, we're taking the road less travelled. Still moving, but maybe not exactly towards the same destination as the other people around us.