I agree, who has the space or the ability to actually implement such a system in its entirety? Even with 9.2 or 11.2 possibilities with some current higher end AVR/Pre-Pros, the units often require additional amplification and if the channels are not used there is the option of re-directing the audio to another zone.

It would seem even with the hype and possible purchase of these latest units, manufacturers know that consumers in many cases will leave the extra channels unused or use them for another purpose.