Riding a bike isn't only about club riding - that's a teeny tiny subset of cycling/cyclists. Most of the women on here don't ride with clubs (afaik), we ride to get from A-B, utility riding, commuting, for fitness, recreation and so on. Getting more women cycling doesn't simply mean to get them riding with clubs on a Sunday morning, but out and about day in day out, fitting it around work, family, other hobbies and activities
Personally, I can't think of anything of less interest to me than riding with a club, that level of rigour, having to follow others etc doesn't float my boat at all and I've never been one for any sort of group sport/activity (including spin classes)