This is not a refutation because I think that you’ve given a nice response to the topic. But I think that the people who are concerned or interested with reaching “everyone” deserve being beholden to the Big Box platforms of today; whichever ones rise and gain steam in the future that use phrases like “foster dialogue and bring people together” in lieu of “drive engagement and bring in ad dollars” then crash and burn under the weight of internal whistleblowers and damning The Guardian exposés.
I think the future of online communities will be community for the sake of community…and nothing else. Very mundane and boring on the outside, driven by nothing other than “I’m sharing waffle recipes and I’m going to just upload them to the internet on my hosting provider or via my old Compaq Presario and I do not care about engagements just email me later and goodbye.”