These 3d perspective drawings are much less convincing in real life than they are in images, because in real life we have depth perception and our viewpoint is constantly moving. This only looks good from that exact viewpoint.
Even with shutter glasses, I'd think there must be some limit on how many users you could have at once without irritating flickering; with 3 users and six different perspectives to render, both displays on an individual user's glasses would be opaque 2/3 of the time, and each eye would see an image for 1/6 of every unit time.