Keyboard could be replaced by thing that translates muscle electric signals to keystokes. Microsoft tried to do something similar. And feedback could be different vibration types on fingertips by some kind of glove. Real gaming of future would be outside of buildings. Vuzix already sells see through augmented reality glasses.

There will be no big monitor - augmented reality glasses. Check vuzix they already selling see through glasses.

Post PC 1. See Through augmented reality glasses (Vuzix selling them now $5000 apiece) 2. Small box that transfers image from Cloud to glasses. OnLive showed it's possible (hardcore gamers sorry) 3. Some analog of virtual keyboard. For casuals kinect like recognition of hand would be enough, and programmers would buy keyboards that read signals from hand muscles and translates into keystrokes.

Because if something could absorb light of particular wavelength it can radiate light of particular wavelength. So hotter body radiates more energy than it absorbs from colder body and energy flow from hotter body to colder one. Second law of thermodynamics yeah. There is quantum magic during absorption and conversion of photons to electric current but it did n't violate energy conserving.