[ssfrr]

Even for a single user you need to add head tracking to get a perspective that shifts as you move your head (though that's pretty doable with consumer stuff these days). For a multi-user system I think you need something more like this.

It could be interesting to do multi-user individual-perspective shutter-based 3D, but you'd need to run at a really high framerate and you'd probably have brightness issues as each eye would only be receiving light for some smaller fraction of time.