Funny, I was just thinking of a crazy consumer product where something like this could be put to use (but not saying what that is!):
The world’s first wearable wireless 3D body motion tracking system based on consumer-grade MEMS combo sensors will be on display at Electronica 2012 in Munich, Germany.
via Wearable Wireless 3D Body Motion Tracking | News | Product Design & Development.
At the bottom – huge growth is predicted in the market for “wearable wireless devices in sports and healthcare”.