When I think about the long term here, there is a supply chain and goods delivery efficiency leap that Amazon made with Prime that would need to be done again in order to dethrone them. Off the top of my head, there does appear to be one more advance on the horizon that could absolutely revolutionize retail. Think about moving manufacturing closer and closer to the end user. One way of doing this is putting the manufacturing right in the home of the end user — 3d printers. A long view of 3d printing would have printers sitting in the homes of people that want various printable goods and making use of some very intuitive selection and payments interface to order and retrieve these good instantly. We’re nowhere near ready for this partly because the quality and diversity of 3d printed items is still pretty limited, but eventually we might get to a point where you could have a print-anything machine either in your house or just down the block and that would obviate the need for shipping and distribution centers for a wide range of items. Supply chain killer.