I'd much rather see a revival of a network of BBSes using POTS lines. FidoNET went to hell decades ago but the protocols and software are still worthy. It would be fun to use Fido tools (mailers, tossers, editors) to create a fun, off-the-Internet electronic forum.
This probably sounds crazy to most of the younger crowd, I'm sure. I just wish that those who grew up without modems could experience the joy of hearing your phone line ring and watching your BBS answer and receive some mail from someone on the other side of the world. The messages were routed from peer to peer by folks who were willing to pick up the tab to make long distance (and international!) phone calls.
In Spain we have the guifi project www.guifi.net/en which works in infrastructure mode, but we are migrating to a new system called qmp and which is mesh based. This firmware is 100% auto config, and works natively over IPv6. The project came from the www.battlemesh.org hacking sessions, where they created the batman protocol.
If anyone is looking at building a mesh network, check tout these systems. They make it so much easier (and cheaper) then it used to be.
Mesh reminds me of the BBS scene I really loved, and kind of puts you in contact with your neighbors.