IDC’s Worldwide Quarterly Wearable Device Tracker report has found that shipments of the Apple Watch have fallen 55%, from 3.6m in Q2 2015 to 1.6m in Q2 2016. Apple’s decline has had a big impact on the global figures, which have fallen from 5.1m to 3.6m in those same quarters. Apple holds 47% of the current wearable market. With Apple’s Watch, it seemed almost certain that there would be strong initial demand that tailed off sharply once the pool of likely buyers was sated. This seems to have taken place, and while the refresh-cycle when the next iteration of the watch arrives will drive sales, there are only a finite-number of people willing to pay that sort of money for…