Don't buy high-end hardware?
This must be a joke. I can't think anything else.
"I've said this a few times over the years so hopefully this won't come as a surprise, but I wouldn't be buying high end cards yet if I was only planning on using them with the open source drivers, even if I could magically run the Intel open source stack on AMD or NVidia hardware."
Of course I understand that with limited developing capacities you can't have any feature of new graphics cards at release time, at least currently. May be better in the future.
But this comment is a slap in the face of anyone that owns, like me, a laptop with the 2008 released HD3200. I am still not able to use the open source drivers on this four years old hardware, which is neither high-end nor nor a recently released GPU, just because it overheats my machine and sucks out the battery in no-time. I don't care about performance or feature completeness, as long as something that is such basic for a mobile machine as power-consumption has issues that are known for a long time and are still not resolved.
Basically this means to me: If you want to buy AMD and use open-source you have to find the few GPUs that are working correctly. That is a serious show-stopper.