Missing the point?
Maybe there are other reasons for wearable fitness - factors such as:
+ is it cool to have
+ is it fashionable
+ will my peers accept it positively
+ does it satisfy my inner vision of myself
+ does it satisfy or convey the image I wish to project
+
...
+ will it encourage me to exercise more or increase my personal fitness
(having, say, MS Office on a mobile device does not automatically imply everyone will try to create prose, plays, movie scripts, War & Peace, ... no?)