I really loved the article Losing Our Touch and its historical account of the way human senses were perceived and valued in the time of Plato and Aristotle. I think we are at a similar Platonic moment in history where we are now very much obsessed with visual experiences, especially in our digital devices. However, I believe the next step for us, as was the case in ancient history, is a rekindling of real touch experiences.
My opinion is that Aristotle's argument in favor of touch as the most intimate sense couldn't be more true. There is a certain immediacy associated with touch that cannot be attained through any other sense. As we have now been using touch screens for almost a decade, we are beginning to feel the glass beneath our fingers, and we desire something more fulfilling.
Wearables do offer so much in this regard. They are on or close to our bodies, they can be used to detect truths about our bodies, and they are full of contextual cues, emotion, and cultural associations that give them great potential to expand the boundaries of what interfaces can be.