NPD Group
The NPD Group is predicting that 9 percent of American adults will own a smartwatch by the fourth quarter of 2016.
Ever since Apple announced its HealthKit developer toolkit, which aggregates data from a number of different self-tracking apps and devices, it's been a foregone conclusion that Fitbit would be connected.
The wearables market, including activity trackers, smart watches, and head-worn displays, is expected to ship 48 million units in 2014 and 91 million in 2015, but after that, the market is expected to slow down for one or two years "as consumers rebound from the initial hype", according to a report from the NPD Group.