How long do you expect the Series 0 to continue getting updates? As a point of comparison, iOS 10 goes all the way back to iPhone 5 which came out 4 years ago (2012). So it will likely be supported for 5 full years. Despite that, I'm afraid Series 0 won't be supported in WatchOS 4 which would "obsolete" it after only 2.5 years. I'm just hoping it'll be able to make it 3.5 years.