expensive Doodad
There's no doubt some of the better-off home theater owners will have audio benefits, but for the average Joe, this will just be another expensive Doodad he can't use.
I love audio, and have spent lavishly to get to where I am. (relative to my income and budget, of course.) Yet, even if my AVR allows for more channels, I can't use more than a 5.1 setup, because I live in a 3rd floor flat, and have no room. Heck, I'm still using a 32" TV because anything larger seems pointless. I have, as a project, the ambition of acquiring a 11.2 channel Pre-amp and Amplifier combo, but I know full well it's overkill and that I will never have 11 speakers on my AVR.
I already have 9 speakers in the living room, and can't even begin to imagine where I could fit 6 more. Many people in smaller bungalows without sufficient room for a dedicated theater room are in the same boat as I am, add to that the myriad condominium dwellers, and you've got a very important segment of the population that just "can't do 11.2 channels", whether they want it or not.
There will be buyers, just not as many who buy cheapish sound-bars