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Presumably, one could prototype something simple and cheap at L2 level with WGS 84->MAC (about ~m^2 resolution), custom switch firmware and GBIC for longish (1-70 km) distances, but without a mesh it won't work.

It was discussed during the IPng days. My view at the time -- and my view today -- is that there's an inherent conflict between that and multiple competitive ISPs. Suppose there's an IP address corresponding to 40.75013351 west longitude, 73.99700928 north latitude (my building, according to Google maps). To which ISP should it be handed for delivery? Must all ISPs in a given area peer with each other?

There go those pesky L2 political questions! //Alif -- "Never belong to any party, always oppose privileged classes and public plunderers, never lack sympathy with the poor, always remain devoted to the public welfare, never be satisfied with merely printing news, always be drastically independent, never be afraid to attack wrong, whether by predatory plutocracy or predatory poverty." Joseph Pulitzer, 1907 Speech