Explained somewhat by the nature of the innovators dilemma and the products they're making: - x86 chips for PC were Intel's cash cow so doing anything to disrupt that revenue stream would be fought against - Apple's cash cow is the phone itself so they don't particularly have any dogmatic loyalty to one type of chip as long as the phone sells

Now if there were a technology to come up agains the iPhone (glasses anyone?) they'd probably face the same conundrum; disrupt themselves or be disrupted?