Gamers venturing away from their desk will still want to to lug along their standard peripherals, though -- as well as it works with a gamepad alone, Windows alerts and game launchers make the traditional pointer a necessity, not to mention the fact that many PC games simply don't play nice with controllers to begin with.
Remember: your brand new Wii U can do literally nothing outside of build Miis and play disc-based games before the update, so don't go freaking out when your console seems to be missing a few key functions out of the box.