I think this will come into it's own with driverless car technology. Once we combine the current automated warehouses with automated delivery the timescale and costs will drop dramatically.
I think the implications of emerging technologies are greater than most people realize. Between driverless cars, voice-recognition systems, and the Internet, it doesn't seem far-fetched to imagine saying, "Computer: deliver one large pepperoni pizza and a Sprite", and having it appear on your doorstep within 15 minutes. All without human intervention.
And then we have 3D printing. This is one tech that IMO is going to come fast as companies continue advancing this tech. And then we can swap delivery time for print time on basic items!
