But keyboards and mice are still just as useful and likely to remain so in the forseeable future, I think for much the same reason that pen and paper are still around in the digital age. Ergonomically, they just work and they're pretty intuitive, especially when you've got a large screen to deal with.
Even in a future in which spoken commands become commonplace, using a keyboard and mouse has an advantage. After all, I don't necessarily want everyone to hear every word I speak into a textbox.
It's like the similar argument about digital books replacing print books. Even though printed material technically (depending on if your definition of 'printed' includes cuneiform) has been around since Babylon. Its being old is no reason necessarily to replace a peripheral, so long as its function is still adequate.
