Someday someone will make a p2p app that follows geographic lines but I don't think it's completly necessary. What if the route through Tokyo is faster? Eventually routers will be so fast that even small ISP's will have the bandwidth that the internet backbone has today. The fact is that there are internet outages that might cut off one or two routes through a geographic area and a good p2p app would work around the fault. If it strictly followed geographic lines then an outage would fragment the p2p network.
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