The only thing that prevents from thinking about this idea in the same way as flying cars is our water delivery network. if we could build that 100+ years ago

The only thing that prevents from thinking about this idea in the same way as flying cars is our water delivery network. if we could build that 100+ years ago (albeit at gigantic expense), perhaps we have finally reached the technology level where we can expand to an extremely high-speed automated 24-hour postal service. When you think about it, society is already curving back towards more delivery services and less 'go and fetch' services - I know I now do more shopping online than I do in an actual shop, and those thousands of dedicated supermarket delivery trucks (and attendant drivers_ are a huge saving waiting to made, alongside the postmen. What we need is for the government to step in and finance a really large scale trial in co-operation with the postal service and the various home delivery services. Mail, pizza and groceries would be enough of a tipping point I think.