mmm.. yes that is true. It will be interesting to see which paradigm wins or we might have all of them exist side by side. Apple is betting on separation of mobile and full size computers. Windows and Ubuntu are betting on the same OS on all screens.
I think either Apple's method or going bottom-up with Android, but they have to fix the problem of making "mobile apps" work well in desktop environments, too. Plus, they probably need an improved Android UI for desktops as well, although the current tablet ICS one comes pretty close to a desktop interface. But they need to enable a more "desktop-like multi-tasking" and so on.
