On the other hand, I might write more about it today. (The weekend wasn't as close as I thought when I wrote that.)
The best #peerToPeer systems allow ordinary people to use them without having to rely on a system administrator, or be one themself. What I described above clearly isn't that kind of #P2P system.
But it is a proof-of-concept demonstration, and I'm sure it would be possible to bundle an #XMPP server with its own internal #yggdrasil component, like @neilalexander's #yggmail does for email.
There's something to be said for the way yggmail lets you use your favourite email client, and that could be one way to go for peer-to-peer XMPP, but another alternative would be to bundle the relevant parts of an XMPP client in there, too (so it doesn't need to worry about client-to-server communication), resulting in an an all-in-one #XMP2P app that anyone could use.
Next time, I might talk about interoperability with the existing federated XMPP network.