I stopped wearing a wristwatch 10+ years ago. It was annoying to wear while using a laptop.
There's clock on my phone, computer, car, radio, egg timer.. I don't see the point in carrying extra one on my wrist.
Smartwatches seem even more pointless to me, redundant and limited functionality and horrible battery life.
This is what kills the wristwatch for me.
Even when I had a wristwatch, half the time I kept it in my pocket because having something strapped to my wrist is just too bloody annoying.