Forgive the temerity of an very retired geek providing a couple Pfennig of opinion from a very tangential viewpoint.
Every business or hobby or technology goes thru a lifecycle. A simple approach would be to suggest a growth phase, a 'flat-and-level' phase, and a declining phase.
I myself cycled thru those phases with many avocations and am now leaving the steady-state phase with flashlights. As I left any specific personal interest, I divested myself of nearly all of the paraphenalia and memberships from that interest. I figuratively and literally left. Time to move on. Change is endemic to life. Personal interests are limited by perceived disposable income/resources and living conditions. Nevertheless, each endeavour provided a valuable education - all of which was stored in to what the Russian language refers to as 'old baggage' to be used to understand new technology and concepts. Remember CompuServe, GEnie, Hayes Smartmodems at 1200 baud, ASCII text progressively scrolling thru line by line on a green screen?
In the business world, many entrepeneurs are able to start a company, but cannot easily transition to the steady-state mode of running a company. They are idea people, not managers. There are some rarities such as Kelly Johnson (w/Ben Rich) of the Skunk Works whose pinnacle of success was the awe-inspiring and still unsurpassed SR-71 Blackbird. Then there are the managers who can perform superbly at management, but have difficulty with significant growth/expansion/change. Finally there are those managers who preside over the decline of a business in to insignificance and bankruptcy. Mismatch of the person and the business phase is a recipe for deterioration. Many hobby forums and boards follow the same lifecycle.
Historically some hobby forums do last longer than others. That is a complement to the sysops, administrators and moderators who douse the incipient flame wars and explosive topics. Yes, some of the oldies fade away, even admins & moderators, because of their own changing interests, yet the BBS/forum survives. Running a volunteer service is not easy!
To propagate any volunteer organization the members need to help the newbies! Answer their questions and provide references so that they can understand further. The newbie often has no historical perspective and is baffled by the terminology and technology. ie: CPF educated me that there was something better than flashlights from REI and Target.
There are 3 phases of progressing maturity: Dependence, Independence, and Interdependence. At the highest level of maturity, we give up some of our independence to become interdependent. Thereby the greater entity grows beyond any level we could have achieved by ourselves or by pushing our own agenda.