It's a very romantic notion, but there's a lot of resources (time/money/hardware/effort) that go into the existing IP layer that's totally invisible. Without a plan on how to supplant those resources, any replacement network will struggle.
You could, of course, run a local wireless IP layer and use this to route, but peer-to-peer wireless has well-known scaling problems.
Still, it looks like a very interesting and reasonably well thoughout out idea.