Like most tech things it will take a "killer app" something you want to do that it is tiresome to look at your phone for. We are used to walking around staring at screens so I think it will need to be more than a notification we can hear anyway especially if that is a cue to simply check the phone. Blackberry had mobile email which was the "end" of carrying a laptop- smart watches in my opinion will need something similar to go beyond the "nice to have" gadget they currently are. It will come I am sure but at the moment can't think of it - in fact laptops (as tablets/surface pro) seem to be making a come back with more people I deal with choosing to sit down and check email rather than attend to on the go as the larger screen becomes more portable. I don't think people inherently like small screens they just manage with them and this currently is the smart watches' obstacle.
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