Using this stats page I filtered it for just "7.1" audio and got a list of 35 titles total. Most were either DTS-HD Master Audio or LPCM, with one or two DTS-HD HR (lossy compression) and no TrueHD or DD+ at all. There were also 13 discs with 6.1 audio. For comparison, I let the list populate completely unfiltered and got a total of 714 titles. That's less than 5% with 7.1 audio or 6.7% with 6.1 or 7.1 audio.

That leads me back around to a question I had earlier in this thread: do any of these players with 7.1 outputs offer matrix processing to generate 7.1 audio from a 5.1 source? If they don't, then it may actually make more sense to use 5.1 output and split the surrounds as previously described. You'd compromise some on those titles that actually had a 7.1 mix, but you'd get all seven channels active for the 90%+ other titles that you watched.