There is no way in all of hell that would allow GPUs to be integrated with the motherboard. There simply isn't sufficient technology to get that kinda graphic horsepower out of an integrated solution, and we won't have one forever.
In fact, in the near future GPUs are going to become far more powerful than CPUs (actually, the latest ones already are) with much greater parallel processing capabilities. Then, GPUs will be just as general as CPUs and will be able to execute perhaps even C++ code faster than the CPUs.
There is no way that will allow future GPUs to be integrated on a motherboard.
In fact, in the near future GPUs are going to become far more powerful than CPUs (actually, the latest ones already are) with much greater parallel processing capabilities. Then, GPUs will be just as general as CPUs and will be able to execute perhaps even C++ code faster than the CPUs.
There is no way that will allow future GPUs to be integrated on a motherboard.