ontop of that, you'd have to put the monitor really close to you. you'd have to have the monitor within a foot or so from your chest.
because i highly doubt any of us would want to have to stretch our arms out 3+ feet ( and farther ) to change the song on our music playlist, or to close a window.
one of these would nearly have to sit on your lap, or be so close, that it causes eye strain.
and i don't want to lay my monitor on my lap. and i don't want to reach straight in front of me to type on a keyboard.
i can see this being used in many buisness fields. but for the general consumer, there is to many problems that will arise. So if it ever does hit the mass market...only a small percentile of people will actually buy and USE it. the rest of the people will stay happily where they are at with their current setup.