Voice-command technology is one of the Sci-Fi things that the consumer neither demands nor uses when it's provided to him/her. Nerds and Trekkies dream of a world where we say "Computer..." and command away, but the rest of us find talking to our computer a shockingly idiotic concept. We've had the ability to interact w/ computers via voice since the 90s (my old Performa w/ the motorola 68040 chip could accept voice commands), yet we all still use mice and keyboards.
In many ways, this new Siri tech is the same as FaceTime (another Trekkie-future concept that the public just wasn't clamoring for) -- neat, a cool example of tech, but something that just isn't useful as more than a toy to try out once at the end of the day.