There are more ways than one to skin a cat
Apple chose to create two OSs, OS X and iOS, Microsoft wants everything under one roof with Windows. The biggest problem I see is that Microsoft is cramming the Modern UI (Metro) down our collective throats. Windows RT is not ready. It's a version 1 product. It has limited functionality for system maintenance.
If I were Microsoft I'd release Windows 8 pretty much like Windows 7, but oh by the way, here's a button to the Modern UI you're going to see on our tablets and phones. Start playing with it. One day soon the Modern UI will be the only UI you need, but we're not quite ready, and we want to make sure that every customer and organization can make the transition at their own pace.
That's how I'd do it.
