I'm considering starting a new project (yes, I know), an #XMPP External Component that is a full MIX implementation -- particularly including MIX-MUC, crucial for backwards compatibility.
At this point I'd only do it with a sponsorship or grant or some such. I don't want to take on the responsibility and sacrifice my free time for it just for it to blow up in my face, I'd much rather have some support structure in place.
@blake You could create a project on OpenCollective under the XSF as a fiscal host: https://opencollective.com/xmpp and see if people are interested in donating for it. But MIX is probably a dead-end with little support and seemingly interest by XMPP clients.
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