Matt Mullenweg shared this article by Jon Udell on the ossification in Wikipedia. Being a part of the Wikimedian community from 2010 to about 2014, I have seen this crystalize on Wikipedia and in the world in general.
Things are a lot worse offline amongst the community – on phone calls, emails and mailing lists. This led to me curtailing offline contributions and contributing edits when I feel like it. Not the best outcome for a community that is trying to retain its members.
Parallel Spirals 