I predict that this sort of thing (Wired: Hearing Aids for the unimpaired) will get increasingly popular as people run out of cosmetic surgery options in their quest to be (at least superficially) ‘different’ from others (which paradoxically tends to make them gravitate toward some homogeneous ideal).
Perhaps wearable mods are a step along the path to what William Gibson described in Burning Chrome where electronic mods to the human body become commonplace.