As an educator, I can immediately think of a half-dozen small interactions/services/tools that I would employ if they did not distract me away from my primary t

As an educator, I can immediately think of a half-dozen small interactions/services/tools that I would employ if they did not distract me away from my primary tasks (or give the appearance that I am distracted, which is often just as detrimental). Considering this, my gut says the real value of a wrist-bound device will be in the development of context & task-specific micro-utilities (rather than simply reducing the need to remove a phone from your pocket to check notifications). So - maybe there won't be a 'killer app'; there will be a constellation of 'killer apps' that demonstrate value through the collective impact of their very small contributions to your life.