This is why I think that the Apple Watch will be very successful. It will likely prove to be a much more ergonimically correct front-end to the iPhone for many iPhone users.
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Possibly the most significant influence of the Apple Watch may be the avoidance of accidents by those now phone-fixated while in motion.
I anticipate far fewer stumbles and collisions with doorframes, lightposts, other pedestrians, curbs and vehicular traffic.
And, who knows -- maybe some of the above folks may actually return to having conversations with their companions...
That may be its real market. As for me, I retired my watch and cell phone when I retired from having structured, tethered time imposed on me -- and I ain't going back!!! '-)