As long as there are people singing and playing there will always be folk music.
The post about folk music evolving could equally mean changing.
Speaking as a creationist, you can'( take something away once its been created, therefore you can only ever add to the tradition. It isn't in decline. Its probably always been a minority interesty, then again, so are most things.
It doesn't mean it hasn't had its glory days, and that there are glory days to come.