Even still, at some point the pocket computer people have will be "good enough" that they no longer see the value in an expensive upgrade every couple years. I

Even still, at some point the pocket computer people have will be "good enough" that they no longer see the value in an expensive upgrade every couple years. If people are trying to replace their desktop, perhaps it will take a couple additional years for pocket computers to be "good enough" at those tasks. But that won't break the inevitable trend. That will just postpone it a bit.