I didn't include my Fitbit in my poll response because its still too primitive for what I think of when I think of wearable computing which is at least the processing power and utility of a smartphone sans cancer damage potential.
I tend to think Dick Tracy's watch meet's the Enterprises talking computer with a bit of projectable keyboard and display thrown in for good measure. I optimistically suggested the end of 2015 as a potential delivery date especially since so much of it is already near to shipping if current commercials are believable. But still, they may be a long way from what users really will want from wearable media which may include: emergency response and rescue, advanced communication, google glasses like photography and journaling, pulse monitoring and other vitals, and advanced worldwide networked weather monitoring and of course entry codes to everything you could reasonably expect to unlock, open or drive with the apps necessary to control them. Still, force field generation is likely to require power generation a century ahead of us. Hmm, well, given Tesla, maybe less.