You are ignorant of the discussion you have just butted in on. We're talking about WDDM 2.0/2.1, not Aero requirements. And Microsoft itself says that new video cards--with technology that is only now being incorporated to the very latest cards from ATi and Nvidia--will handle WDDM 2.0/2.1.
"The gotcha is that
improving GPU task scheduling will require new hardware, he said. The overhauled device driver model, WDDM 2.0,
will only run on a new, yet-to-be-released generation of GPUs. NVIDIA and ATI are already aware of Microsoft’s plans and are working on new hardware."
Read. Cure yourself of your ignorance.