AVR makers are producing 7.1 in anticpation of future Blu Ray Disc 7.1 production. So far, there are only about 25 BDs w/ 7.1 and about 10 HD-DVD (and there won't be anymore of those).
If BDs really catch on as a consumer preference over SDVD (so far, they have not), I believe eventually all BDs will be 7.1.
If BDs really catch on as a consumer preference over SDVD (so far, they have not), I believe eventually all BDs will be 7.1.