We went from giant clunky televisions and cell phones they size of pop bottles to plasma screens and cell phones the size of a deck of cards that can do far more than just call people. The last five years the tablet has added another technological evolution that will only continue to grow.
In 20 years, there will likely be no paper books produced at all. Everyone will have some sort of electronic reader device and be able rent, buy and borrow every type and genre of books imaginable. Computers will continue to invade out life not only in work and home, but also car and all about us. Billboard will be electronic and in tune to change with the needs of the people passing by. The advertising technology that Facebook and other websites developed will be used outside the Internet.
Cars will be completely electric or hydrogen-based and gas stations will charge instead of sell gas. The world will be filled with every type of renewable energy and coal fired power plants will be in the process of decommission. The price of coal and oil will continue to increase leading to a revolution in fuel and power.
The seeds are already planted and the world is already beginning to lean in these directions. Keyboards will be replaced with hand gestures and laptops will be completely be replaced by tablets.