The iPod peaked at 55 million a year. This prediction would put the AW above that. Nothing is the iPhone. I don't know why you'd expect that or even bother commenting on it. Clearly a device that requires an iPhone will only have a fraction of the iPhone sales (it's unlikely that someone would buy an Apple Watch without an iPhone...).
But I didn't comment on iPod sales, you did. One could argue iPod was a niche product too but it was magnified because Apple was a smaller company back then so fewer sales still had a bigger impact and Apple's marketing + iTunes make it high profile. To illustrate this consider iPod in 2007 was 25% of Apple revenue. Last year all of "other" which AW is in was 6% of revenue.
I commented on projected AW sales at 7 years out vs actual iPhone sales at that same point of it's history. I did to illustrate a truly social changing piece of tech vs AW's slower growth as an accessory, not a full breakout product. A lot of people -- some here -- think it is a break out product. But these numbers show it's as you say, something only a small fraction of iPhone owners will consider even 7 years after it's introduction. Again, this is NOT a knock on AW. Watches are a niche item. But Apple isn't going to manage anytime soon to convince the world to put an smartwatch on it's wrist as it has a smartphone in it's pocket.
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But its simply insane for all sorts of reasons to use the success of the iPhone as some sort of realistic barometer for the relative success or failure of other products.
Maybe, but it's more insane to read what I wrote as saying AW was a failed product. I think you read what you wanted to, but I urge you to go back and read closer. My comment was not a knock on AW. Heck my opening sentence is "solid growth." Failed products don't have sales growth.