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I guess the ultimate question I'm trying to answer through these sub-questions is how active is XMPP development and what parts are failing. I do think that the world needs a chat protocol that's open and extensible, and the question is about health of the de-facto protocol I know of which was designed around these principles.
There has been a recent resurgence in interest for chat protocols, but I don't know of any that are designed with extensibility in mind. This [HN comment thread](https://news.ycombinator.com/item?id=17064616) discusses how XMPP/Jabber and Matrix compare. If XMPP currently stands to fail, are there attempts to standardize protocols that supersede it and aren't affected by the same problems?