Yes, we do need someone to take over from existing organisers but is that really the most important thing? Surely, unless you have an audience and someone to entertain them, there is little point in organising an event. I presume by organisers we are talking of clubs and festivals. Bear in mind that these are a recent construct and folk music has been going a lot longer than either. As long as people like Jon are performing, they will find an audience with or without formal organisation. After all, did the source singers need clubs and festivals?