Unless its something like they had on ARK-II back in the 70's, ( and that would not be too practical ) a smart watch will always be a gimmick, unless there is some sort of way to make the screen appear bigger than it is.
Not being a Luddite, or not 'thinking outside the box', its far to small to be really useful other than for telling time. Just from the proliferation of larger screen phones you can tell that going smaller is not the direction people want to go for usability or functionality.
Sure, you can have alarms, and scrolling banners.. but your phone can do that, and so much more, without the 'squint' limitation...