The entire point of having a battery in a watch is so that you don't have to worry about winding it every day,,, it's good for 3 years and then you replace the battery when it goes.
If I'm going to replace my watch, something that I've been using for years, and have only had to replace the battery twice since I got it, with something newer, then that newer thing should not create additional inconveniences that far outweigh anything it can do that a watch might not, particularly when there is nothing that it will do which a smart phone does not already do anyways.
There are a fair number of people out there who happily traded the 2-week battery life of their perfectly functional cell phones for dead-in-a-day smartphones. As it turns out, the inconvenience of having to constantly recharge a smartphone was worth putting up with in exchange for being able to do all the things you can do with a smartphone. Clearly, not everyone shared this sentiment, as you can still see any number of people using non-smartphones today--but significant numbers of people chose functionality over battery life.
It's hardly a stretch of the imagination to see the same thing happening with smart watches.