This is just stupid. So I don't need a dedicated "single piece of glowing display" in my hand anymore, because I happen to have a doorknob nearby with "some sort of chip implanted within" that is "connected to the internet". So to read a message, I will go touch the doorknob, and then a nearby light begins flashing the message out in morse code? I know that sounds dumb, but that is what he is inferring, right? You don't need a device in your hand because there's just a random assortment of connected stuff all around?
Dedicated devices purpose-built for interacting with humans will not go away until we have some kind of direct mental link to computers. The keyboard hasn't been replaced by touch screen devices. It serves a specific purpose that cannot be replaced by any other method of input, including speech recognition (I can just see myself coding with speech recognition - "Next line. Next line. Next line. Move right 5 words. Left one word. Right one character. Right one character. Delete. Ampersand." Uh huh.)
There is also the personal / privacy aspect. Just because I can project something on a wall 10' wide on the other side of the room doesn't mean I want to read and reply to my private messages in that way. What if there are 5 people in the same room? Who gets the wall? Or do we carve it up into 5 pieces? "Son, you take the left half of the coffee table, and mom, please take you feet off the coffee table so our daughter can use the other half. I get the west wall today, and hun, you can do your FB on the ceiling."
The number of holes in this silly prediction of the future are simply too great. It will not unfold in this manner.