Who Killed Q Sound?

I find the soundstage of a Q.Sound recording to be much superior to any other comers. So why did it die out after only a few years back in the 90s?

If you are  unsure if you have experienced QSound, listen to Roger Waters, Amused to Death, Track one, 2 minutes 20 seconds, The Jaguar.

The growling  should appear to be originating 4-6 feet outside the right channel speaker.