I remember the first home computers. My girlfriend had one. I used to go to her house to play arcade games on it. I certainly never foresaw a time when I'd be doing, well, what I'm doing now.
The next big thing is the 3D printer. The technology exists. Printers are being used to make everything from guns to human organs. I don't know anyone who owns one yet, but I expect I soon will. I expect to own one myself. They're going to change the way we consume- and the way the world does business. You want some common household object- anything from a car to a washing-up brush; you no longer go to the shop or place an order online, you simply enter a code into your household printer and "voila!". I understand the first models are well within the budget of an average middle-class family- and the price keeps coming down.
We'll wonder how we ever managed without them.