So I propose (years late, many bucks short) we just toss it all in the bin and go back to the beginning. Blogs, newsletters, IRC, mailing groups, and, sure why not, Usenet, go nuts. (The jury is still out on forums, but I suspect they are actually a stunted malformed sapling sprung from the same seed of evil that created modern social media.) These things are time tested, functional even in the face of overwhelming lack of interest from the general internet, and are, most importantly, utterly unbreakable. A specific blog, irc etc etc might disappear, but that won’t take anything besides that one facet of a larger whole with it.
I don’t think this is just nostalgia, though there is some of that. The “old” internet was robust and vibrant in a way that modern sites aren’t.