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The thing is, the Internet routing protocol BGP delivers basically everything that a mesh network requires, except for the physical data links that carry the data. Keeping things short, BGP is a way to declare where certain IP addresses can be found. So an example announcement BGP would be something like "2608:120::/32 can be found at AS721", where AS stands for Autonomous Network, a subnetwork that is controlled by a single entity. In this case, that IPv6 range belongs to the USA Department of Defense (DoD) and AS721 is the identifier for their network.
Now, the trick is to figure out how your own AS can reach the AS of your destination, which is no different than a mesh: the DoD's AS721 is solely connected to AS3356 (the massive ISP named "Level 3"), which is a very likely connected to the upstream AS of your link to the Internet, which means there is a valid path from your AS to the DoD.
Whenever an intermediate AS disappears from the global Internet, its former peers will reroute through other links to maintain a path to the largest number of AS's (as in, the Internet). In this sense, having multiple links to different AS's is important for redundancy, and is no different than a mesh network having multiple RF paths.
Finally, if multiple link failures occur -- say, a Tier 1 ISP goes completely down -- then the network becomes fragmented, but traffic within each fragment will still pass. This is akin to a mesh between two cities, where the mountain-top repeater is struck by lightning. Locals in each town can still send messages, but not over the hill to the next town.
Is BGP perfect? Heavens no. And it has its own issues with maliciously-crafted announcements. But everything that BGP does is analogous to what mesh networks do. It's merely that the participants are highly commercialized today, whereas in the 80s, it was mostly universities and a few defense contractors experimenting.
The technology is basically here, but it's how it gets used that will dictate out how history will be written.