What point are you trying to make? Nvidia said they need more wafers. So? I don't see one Kepler based GPU I can put in my shopping cart, did someone buy them all already? The need for more wafers strongly suggests they are using the wafers for something, which begs the question. When is Kepler hitting the market? Why didn't Nvidia give any granularity here?
BTW, lower yields mean the need for more wafers because of waste, so for you to say, "less than expected yields not the real problem" is silly.