Watches seem to be the big thing right now, at least in the rumor mill. But I'm skeptical. People have tried before, heck, Microsoft had SPOT, but it's always failed. Like the article said, the closest we've come to success so far is the Pebble, and that was purely on speculation. Those that have received a Pebble don't seem all that impressed. If someone actually does create a useful smart watch, they'll have the next iPhone product, but I'm just not seeing it happen, quite frankly.
Things fail until they don't anymore. Case in point: iPad. Apple wasn't the first to create a tablet. Listen to Bill Buxton.
That said, I can't imagine a smartwatch that I'd have to charge once every couple of days, even once every couple of weeks. It has to last for a very long time; so for that to happen I guess either some clever engineering or a breakthrough in battery technology has to happen. Right?