Normal vision requires separate images for each eye to acquire 3D. In the past this has been done by red/green eyeglasses or polarized eyeglasses to deliver a different image to each eye. Red/green eyeglasses cannot deliver a full color image and polarized images require projection of polarized light. Another system is possible with kerr cell shutter systems for each eye on eyeglasses keyed into images timed for each eye which would permit full color 3D. A signal broadcast to shutter each eye alternately timed to create a 3D full color image should be possible using infra-red signals from a signal out of the TV into responsive kerr cell eyeglass shutters.
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I have seen a system recently where 2 lasers cross in a transparent cube filled with rare earth elements. At the intersection point of the beams there is a fluorescence of light. When a lot of point light sources are generated in this way you get a genuinely 3D image appearing in the cube.
It turns out that the display is the easy part, how do you build a camera to generate real time images to be displayed in this cube? it would have to surround the things it was filming which in the case of a large outdoor scene is not going to be easy.
Three cameras pointed towards the center of the scene might do the trick. Perhaps a very tight radar or sonar beam to "feel" the surfaces could control the fluorescent readout dot and be more accurate than cameras.
Very doable, theoretically. A 3DTV network did exist about 6 years ago, but went nowhere due to lack of market penetration and cost of user hardware.
The only thing is how would it work with existing MPEG2 based digital platforms? (the 3DTV channel was on analog satellite.)
A company called StereoGraphics makes such a product for computers called Crystal Eyes. It actually makes more sense with computers because (1) there is much more 3D "content" on computers (i.e. 3D games) and (2) the refresh rate is higher.
I believe, too, that there are now screens that enable a certain amount of 3D viewing. They accomplish this by having two different views on the same screen. Recent technology uses this for privacy screening - a person to your left will not be able to see your laptop screen. They refined it so that two totally different desktops can be used by two people sitting side by side. I think this same technology can be narrowed for each eye.