I tried to read this, but it got super redundant in making its point after 100 or 200 pages:
https://en.wikipedia.org/wiki/Bowling_Alone
Basically a lot of statistics to back up perceived notions that there's declining membership in civic organizations, clubs, recreational adult team sports, and lots of other things.
The book looks at it as "social capital" as it relates to civic and political involvement in the community. But address things like.............bowling. As a whole, the same or more people still bowl. But, league attendance has plummeted.
I theorize the same may be true for cycling. Similar number still "cycle", but they aren't members of clubs, race teams, and larger organizations in the same numbers any longer.
Worth a look for people really interested in the topic in general.
Flows of information and entertainment came from these organizations, be them civic or cycling clubs. As the internet, rapid fire news channels, Amazon, HBO, all came to fruition.............the need to attend a civic organization to talk politics and learn information is gone. The need to go to a LBS to get parts is gone. So, numbers dwindle.
Now, instead of organizations that used to cultivate...........we've got people that consume from limited sources of political information all the way to entertainment value.