The user interface in this application will be critical. If an intuitive interface is developed that allows the instructions to be scaled, overlaid on the task, and easily controlled by a working individual, this could become the next killer app for repair technicians and training users.
The capability and application of wearable electronics are still unknown. Google's youtube videos have a couple interesting show cases. Whether they will become a popular apps is still to be seen. Yet, the application area as suggested by the article are very interesting and most like be applicable to a lot of areas.