DRI For 2D Graphics?

Dan Farrell asks: "I know that we have DRI working good for 3D direct rendering. But DRI is quite a good infrastructure, why aren't we using it for 2D graphics as well? It seems to me that all of the complaints about X would disapprear if we got the Render extention finished, and used DRI to directly render everything(and maybe made X multithreaded and had it automatically re-nice itself... but that is me being greedy). I guess what I want to know is why we aren't using DRI for 2D graphics and video?"