I think that the solution is similar to what he's proposing for the social networks: decentralization. One example would be to take hint from github, and allow articles to be forked when they reach some threshold of editing warfare. Embrace and aggregate partisan takes rather pursuing the noble but chimeric goal of neutrality.
RationalWiki is not, and I'm not sure why you mentioned it. It's not a Wikipedia fork or alternative. It's not even trying to be one, it has completely different goals. The only thing they have in common is the fact that they are both wikis, but there's thousands of those around.
The "noble but chimeric goal of neutrality" is core to Wikipedia's content policies [1]. Abandoning it would be an abdication of their mission.
I remember watching a BBC documentary about the history of the American Revolution -- it was very different than what I was taught in the USA.
Read Ishmael as well. Similar take on, according to some, all of history.