I've been wearing a watch every day for years and I have no interest in this stuff either. Honestly, I like the idea that my watch is just a stupid thing that tells me the time, having it beep at me every time I get an email would just feel like I'm being tethered to a computer even more than I am already.
I think those who normally wear a watch will be excited by this, and perhaps that is a big enough market to make it worthwhile?