Modern (or at least future) video cards accelerate 2D operations through the
3D pipelines. From the programmer's perspective they can still be
programming GDI or EXA or XRender, but from the driver's perspective you'll
still need to support 3D operations and have a unified memory management
scheme for all the different APIs you want to support.
What I was merely talking about is the 2D processor engines that you
traditionally targeted through 2D drivers like 'nv' or other X.org DDX stuff
is going away.