The digital world has grown from requiring a warehouse to store a computer to having hundreds of digital books fit inside a small handheld device. To have access to a wide variety of physical goods you still have to have a warehouse like Walmart store tens of thousands of things. If replicator technology, like 3D printers, continue to advance as other digital technology has, then we will have access to thousands of goods at home or a nearby UPS store. You will have access to real-time goods across the board, not just real-time delivery of goods from the store to the end consumer.
Read more about the real-world vision of Replicators and real-time goods.