I feel this could be reality soon because there has been lot of innovation happening in this area. Apple has been recently granted a patent, which tells us that Apples R&D is actively looking into this domain. Also there has been lot of 3d products coming out. For example the 3d LED TV's from Samsung and others are also because of active research in this direction. Not to be left behind the projectors are also becoming smaller and smaller. Chip makers like Texas Instruments are also pursuing this domain. TI has a line of chips of its trademark technology DLP used in projectors.
One more technology that could kick off soon is something what Swpe is pursuing. User input to these hand held mobile devices is moving from hard keys to soft touch screens. So naturally the user need not key in the characters he wants to type in. But still these devices use the standard QWERTY keyboard. This keyboard only suits the standard PC's or Laptop's. These tablets devices should use some other innovative method for user inputs. Swpe seem to have cerated some innovation in this area. However they still use the QWERTY keyboard. Probably they have to redesign the keyboard to suit these devices.
There has been recently lot of buzz about NFC with the Android devices. I'm really excited about all these stuff happening around. Lets see if my predictions become reality.