Move to 6.1 or 7.1 surround sound justified?

From the article:
Why bug people with a choice that most would rather not make? The expansion of the 5.1-channel standard was born in the moviehouse, where it's easier to cover a large space with surround effects if you add a back channel served by speakers in the back of the house.

In film exhibition, 6.1- and 7.1-channel systems make sense. At home, however, 5.1 channels are quite enough. It's easy to generate a solid soundfield in a small space with three speakers in front and two on the rear of the side walls. To me it's self-evidently nonsensical to have four surround speakers outnumbering the three in front.

http://news.designtechnica.com/talkback103.html