> iOS and Android have no relevance in this discussion as they are not real OS'es... And that's how it will remain.
This sounds seriously shortsighted. So far, Android and iOS are focused on media consumption, but I'm already starting to see them used for 'work', like taking notes in meetings. Asus' transformer line (tablets with a keyboard dock) shows where the next step might be.
There's no rule that 'real work' requires a WIMP (windows, icons, menus, pointer) interface. It's perfectly possible to imagine that in a few years it will be possible to develop on Android devices with some peripherals attached. There's no fundamental obstacle to it.
I don't think the PC is dead - there's still a lot of software and user experience built up around it. But it's quite clear by now that tablets/phones are becoming serious competition.