A massively parallel Mill is possible, but not a GPU (which are very different architectures). Think Sun’s Niagara or Tilera. Currently most of that market seems to be 32-bit, and Mills would be overkill, but it may evolve up into our range.
GPUs are wavefront machines, lacking real branches and recursion. The Mill would do a good job of software graphics for business-type machines, but for game-type horsepower you want a GPU handling the triangles.
Or so we have expected. Won’t know until we see what people use them for 🙂