Bought a SB i3 laptop for $400, installed Debian and the graphics simply worked. No futzing around with proprietary drivers. Video is perfect.
Hopefully this will be a kick in the butt for AMD and nVidia. FOSS support for HD8000 from the start?
Oh and I'm running KDE4. It's come a long way and just works too - after I experienced some showstopper bugs (like hung terminals) in XFCE4.
I think Arch is labeled as "Linux" on the graph however it's probably a tainted stat if it's all unnamed Linux's. Gaming on Linux doesn't usually require massive amounts of GPU unless you're using Wine. I have a moderate system but all the "native" type games (HiB and Desura) don't even began to push it. One exception maybe Xonotic but I can still play that max settings 1920x1080 resolution ~200 fps. For what we have now any Intel with HD onboard should suffice and it's cheaper than adding a dedicated video card so the trend doesn't surprise me much. With maybe the exception of AMD's apu's not being more popular. Driver issues aside of course.