I completely agree with pparks.
I actually happen to own an iPad and I can tell that it's just a toy for the baby - he's happy to watch cartoons on it, he can operate it completely (well, almost completely) on his own, choose cartoons saved on it or from YouTube (not that he's really allowed to browse that alone, but sometimes he manages). Oh, I forgot to say, he's 2.
I on the other hand need computers for work. What I gather is that typing on a keyboard is way faster than by using touch; using a mouse to click on something on the screen is way better than using my finger, basically because of the size of the finger; the list just goes on.
For work I need a desktop, maybe a laptop when I travel. What I need from the OS is speed in actual OS tasks - copying files, moving files, dealing with external devices. In my opinion playing music is not a task for an OS. But utilizing the theoretical bandwidth and/or disk read/write speeds in order to transfer files from one drive to another faster than 1MB/s is. From that viewpoint I don't care much about the GUI (except that please don't copy the MacOS and don't create this horrible menu bar on top of the screen that is supposed to apply to all windows at the same time). This Metro thing does not add anything to my computing experience. So if I can simply turn it off and get on with my work - that would be nice.
And of course, unless Windows 8 comes up with a significant advantage in speed, I see no reason to change from Windows 7 at all.