The thing is projectors with 3d support are still produced. It existed as a small market before 3d tvs appeared and disappeared and still is. If the shutter can be moved to the projector aperture and used with passive glasses like in that video what's the reason to still produce active 3d glasses? If it is to retain brightness in 2d mode there could be a detachable component before or after the lens. Granted I don't know how this all works and the video may be fake or false.