If DRI is disabled, then the Radeon driver will use the older MMIO mechanism to do 2D acceleration. I don't know what if any of the other drivers will use DRI for 2D or Xvideo currently, however any hardware that supports using DMA/IRQ for 2D accelration or other stuff theoretically at least can use the DRI to do it.
I think that's the right model to follow. Cards that can get benefit should use the existing DRM mechanism, even if they don't support 3D. I believe that the i810 uses its DRM for Xv (or maybe it's XvMC...it's something video related).
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