That's not far at all. If they can manage to get their shit together and provide a reasonable user experience, the day when a Mac (not necessarily all Macs) run the same OS and the same apps as iPads and iPhones is not far off.

Also, it is not a far off prospect at all, since the Surface Pro tablet will run Windows 8 Pro (on a Core-i5). It'll be able to run almost any windows app, even photoshop or visual studio (or MS SQL for that matter).