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That's silly. Of course you can. Haven't you learned nothing from @DarthCoin and submarine swaps?
This idea of redundant population is very weird. Someone is only redundant if mentally incapacitated by indoctrination.
This is akin to thinking we are at the peak of technology, which is and never will be true IMO. There will always be more thinking and creating to be done.
How big is LoRa or other long-range around radio tech around the world?
Once data carriers are disrupted and decentralized at scale, ie network meshes everywhere, the "wHAt if TheRes no inTErnEt" question goes out the window.