3D printers will change the paradigm of life once again. Instead of finding what you want, paying for it, and then having it shipped to you, you'll download the file and print it out in real-time.
We'll be saying.... "When I was your age, we didn't have 3D printers. We had to wait for containers from China to float over the ocean in big ships, be transported to the warehouse by trucks, unloaded by humans, inventoried by other humans, and then a month later, a company called UPS would finally deliver it in a brown truck to everyone's house."
Kind of like how hand-writing and mailing a letter to someone was like 20 years ago... or waiting for the newspaper deliver boy to drop off yesterday's news on his bicycle. Or going to Blockbuster to rent a movie.