I recently unearthed a pile of copies of local folk magazines from 25 years back. At a guess I'd say that around 60% of the artists on the club and festival guest lists are the same names getting booked now. More than half the rest are already nationally known names from the next generation of traditionalish artists, mostly children of folky families from before. From that evidence and what has already been written here, I'd imagine convincing the promoters to book anybody new or without a folky pedigree would be next to impossible. If the Villan's club is typical with half its audience aged between 70 & 90, they're going to be pretty resistant to change too. I'd say the existing clubs are very good at preserving themselves (in the formaldehyde sense), and most likely automatically hostile to incomers or anybody who might suggest change. Why not start a new one, that would be a better idea.