There are billions of people who are adept at using cell phones but have never owned a personal computer. Some of them can afford Apple products, but may not have thought they needed or wanted a different form factor before this year. Apple is betting that they will want a device that can act as a seamless extension of the computer they already have (their cell phone). Apple is doing this by gradually purging all things that aren't first-class on mobile, be they user interface affordances or the x86 instruction set.