Ignoring energy costs I still don't see this ever happening. The liability costs to Amazon just see too high. If this crashes over a highway and causes an accident or say it flies into a young child playing in the front lawn. It just seems like a legal nightmare.
There is an idea I've had that is similar to this but likely even more impractical. Have you ever been to a drive through bank where they zip containers around about this size in a vacuum tube system? If you aren't familiar with what I'm talking about I just found one on eBay, here
. Anyways we already have water lines, sewer lines, and electric lines running to our homes. If this service were deemed that important just image everyone having one of these vacuum tubes running into their home. With the right control systems in place one could address a package to anyone else and we'd all be able to use it... not just Amazon. And it wouldn't have to be shipped to within some fixed radius of your home if the whole country was connected this way. Say I want Brandon to solve my Bubbloid122 puzzle for me. Just put it in one of these:
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Type in Brandon's address and hit send and a few hours later it could pop up in his living room. He could solve it and then send it back to me the same way. It will never happen but then again I don't see Amazon using flying drones either.
But I'd be happy to see them prove me wrong,
P.S. What I think is more likely to happen eventually is everyone will have a very sophisticated 3D printer in their home. Someone then orders a small part (like the one shown in the video) and it just get fabricated there in your home in the 3D printer.