Maybe I don't get it. With video, all I hope to achieve is to put the sound where it originally belonged, with a reasonable sense of realism. I suppose improved directionality is an improvement, just as is better resolution (audio and video). In my 12 by 16 foot room, there isn't much more space, even in the walls/ceiling, to achieve that. And, as much as I enjoy the theater, my audio system will always be the first priority when significant additional resources are available.
On the other hand, if I were starting over, I can imagine several dozen, small, wide range drivers scattered about the room, none of which would require much power, but all of which would present a substantial combined result. Of course, for those of you who know me, each driver/channel would be voiced to maximize frequency response at it's location. I guess I better start buying more EQ channels:)