Tablet is just a "smartphone" with a bigger screen. So it will be replaced by the "smartphone" when wireless display tech is both direction, i.e. display and input. In future, when I need to write/read a book, I bring out a foldable LCD display, "airplay" connect to it with my "smartphone" (Siri hit the screen please!). Or go to a meeting room with such screen, airplay to it to present my ideas. Or in StarBuck, pull out the LCD screen on the table, and airplay to it. Or the screen might have Kinect like sensor so I can interact with it like Minority Report. Or the screen might be by a corner of my glass (Google glass), so I can "airplay" to it. All this from my "smartphone" device hidden in my pocket. By then screen is needed less due to Siri version X, as most interaction and info search is by voice. For x-Apple people, just substitute Siri/AirPlay with similar tech names.