People seem to forget that high end GPGPU processing really isn't necessary on low margin gaming cards.

NVIDIA is a savvy company which makes a killing off of their highly capable Tesla and Quadro cards. If I were them I would continue down the GPGPU "lite" path for gaming-oriented products and only release the larger-die, more expensive to produce but GPGPU heavy cores into the professional ranges for the time being.

Meanwhile, development can continue towards refining that same high end part in case AMD somehow (but not likely) manages to release a card within the next 12 months that effectively beats the GTX 680's successor (GK114?).