Over the years of being involved in online communities, I have observed and participated in several complete cycles of birth, development, and decline of forums on various topics. Recent examples are ХБ and ХП. The concentration of social activity, all else being equal, accelerates the natural course of events — at first it contributes to a rapid growth of the forum, but later it also accelerates the processes of degradation.
Therefore, for the stability of the community (after all, it is the community that holds the greatest value, not specific sites), it is desirable to have several supporting platforms — this reduces the intensity of turmoil and also forces the management of individual platforms to act with an eye on competitors and not become complacent.
For example, at the moment, the ХВ orgs are positively influenced by Пит, НумВан, Скорпиона, and maybe a couple of other people. So as long as they keep their finger on the pulse of events, the train won't go off the tracks (or will do so slowly). But if for some reason they step down, reduce their activity, or fall into some kind of heresy, and the second-tier orgs (like R55Max) start dictating the policy of the online трешка, then a sad turn of events is inevitable.