I've been asked to help a local club (founded 1933) with declining membership (and revenue) to revitalize itself. Most clubs have seen large declines/ever higher member median ages for decades whether social/community (Kiwanis, Rotary, Jaycees, Lions, Shriners, churches, etc.)
I've never considered these clubs because, at 57 yrs old, I've never known anyone who was a member of these organizations nor have I ever seen or heard of anything they have done in the communities I've lived. Out of sight. Out of mind. I still don't know what they do . . . and I'm still not interested in finding out.
or social/activity (golf, tennis, boating, swimming, bridge, bowling, etc. - even fitness clubs in some cases).
Team sports obviously require a group of active participants to play as do competition in activities like golf, tennis and boating. I've never been particularly competitive in sports so I ignore these too.
I've played golf with "the guys" and I was part of a poker group for 15 yrs but that was just social activities with my friends. I tried a camera club for a while in the 90's but they turned that into an unpleasant competitive activity too so I dropped out. The one group I did like was Great Books Discussion Groups.
I think the factor that promotes hierarchical dues paying organizations is the closeness of the community you live in. It could be a small town or a close knit neighborhood in a city or the school district your kids are in or a common experience with breast cancer or Alzheimers or poverty or the environment.
The things I think go against these organization are:
1) The culture has moved toward people doing what they want when they want. Call it individualism or selfishness or the Me Generation or whatever,
2) In our generation we've become two earner families. As women have entered the workforce there is no one at home and work consumes the time that one person in the family could devote to community activities.
3) Communities are a lot less cohesive. I think there is a significant portion of our generation who have moved through a lot of homes in a lot of different places. I suppose this could go both ways. It might make people disconnected from a place or it might compel some people to join organizations of the communities they move to.
4) Information and communication have increased dramatically. When your dominant information input was local then you lived local. Our attention is directed everywhere now.
5) There is so much more to do now and it is so much easier to go there and connect with other people in other places. With the availability of a larger variety of activities people have not committed to any one activity. As others have said, Social Media dominates how people find things to do.
There are probably more examples but I'll quit there.
Regarding your question. I don't think you can revive an old organization that isn't or doesn't want to be synchronized with the present.