On the other hand, there are products that have a lot of inertia built into them based on the success of their ecosystems. For example, regardless of whether yo

On the other hand, there are products that have a lot of inertia built into them based on the success of their ecosystems. For example, regardless of whether you believe tile based interfaces in Windows 8 / Windows Phone are interesting / useful, they are different. Apple simply can't go there (quickly) without having to move the entire ecosystem of apps along with it. It's effectively a once in a generation change, much like the OS9 to OSX transition.