That's not the point. You are trying to minimize the importance of HDMI/HDCP to the HTPC crowd when in fact it is as important as or even more so than gaming performance. You're also assuming that R6xx based parts will be too "slow" for gaming in common HDTV resolutions which is highly doubtful.
Maybe not R6xx, but the G84/G86 direct competitors are the RV6xx products and i doubt any RV610 (perhaps even RV630) will be used for "serious" gaming at 1920x1080 (progressive scan, of course)...
So i can definitely understand why they only pushed for a mandatory HDCP key at the top-end model (8600 GTS).
Let's face it, most HDTV's have at least a component or D-Sub VGA connector (where i live even most low-end, el-cheapo/no name brand, 26 and 32 inch LCD HDTV's have at least HDMI, VGA and component), and most sub-129 dollar graphics cards do have either one or all of them (my old NV43-based 6200 PCIe has both
and DVI).
"Low End" is about having the lowest possible upfront cost, and including a HDCP key is not a cost effective measure, especially so when the ICT flag isn't something we'll see enforced any time soon, unless the Sony's or Toshiba's of the world are suicidal and
don't want their respective HD optical disc formats to be popular enough to replace DVD's in consumers minds.
And the HDCP key is mostly a fixed licensing fee per board, something that doesn't "go away" with process shrinks.
Getting back to my PCIe NV43 6200 (something of a rarity, with a full 128bit bus, purchased brand new for 39 dollars just two years ago...), it has Purevideo, component adapter, supports HDTV up to 720p/1080i (on component, because it can get to 1920x1200 via D-Sub) and is Vista Premium ready.
I can watch Blu-ray movies with it (via VGA), and i've also used it with a borrowed X360 HD-DVD drive, working flawlessly.
For the price at the time, it was a real bargain.
My point is, HDCP is not a required "feature" just yet, and by the time it's actually needed, we'll be able to buy an HDCP-enabled low end card with much more 3D and video decoding/encoding performance than today.
Of course, i have this "buy it when i need it" attitude, but i think it also applies to the high-end (i really wouldn't care if a 8800GTS had DX10 or not compared to the X1950XTX, because both are about equal in performance with DX9 games, and the
real DX10 software is still months away -not to mention the unknowns about how fully matured DX10 games will be running on first generation hardware, or will they need to fall back to DX9 due to speed issues-)