“Always connected” meshes don’t scale, but fragmented meshes that use store-and-forward for some data are workable. I’d like to see someone do this with Nostr. The main issue is that you’d have to limit the size of data in transit, so rich media is probably not realistic.

Think FIDO protocol rather than the always-on internet we’re accustomed to.

A mesh of meshes may also be possible in theory.