[nmca]

You have some proportion of power users that are outside NAT and WebRTC (they run a non-browser executable), their addresses can be shared over the network and stored locally. They provide STUN on rejoining, but are not hard-coded.

(Overall, yes this whole thing is a vaguely bad idea. But not totally degenerate / non viable, just not practically worth it.)

[pdxww]

If this idea worked in practice, go-ipfs/js-ipfs wouldn't have so severe problems with connectivity.