The tablet has had a remarkable run the past few years. But it is important to note that in the majority of use cases tablet are not replacing PCs but rather are extending the life of PCs.
We know from our data as well as a number of other firms' research that over 90% of tablets sold today have been sold to existing PC owners. And in nearly every supporting data point I have, those tablets are being used to accompany the PC not to replace it. (By PC, I generally mean notebooks).