Apple Watch Adoption
The Series 3 is being adopted incredibly quickly and just last week became the most popular Apple Watch overall amongst my users with 33% of the overall user-base. The Series 0 is steadily falling, currently at around 24%.
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I don’t know how low Apple would feel comfortable cutting off support for the Series 0, but it certainly seems like it is a possibility.
The big difference between the Apple Watch and the original iPhone or iPad is that many people (perhaps most) do not run third-party apps on the watch. Those people are not even counted in David Smith’s numbers.
See also: Under the Radar.