I think this thread misses the point of the iWatch. I think did too initially.
I write iOS Apps and I've had good success with them.
So on the announcement of iWatch I immediately thought about how to make use of the iWatch.
Jump on the bandwagon, why not?
But I can't really think of any good way that the watch augments my Apps.
I could extend the daily notification to the watch but really it's not a game changer for my apps.
I use them myself and love using them on iPhone and iPad, but on that tiny screen with what appears to be a fiddly UI? Nah...
I've not bought an iWatch yet, I've thought long and hard about it but I think I've arrived at the conclusion it's worth trying the cheap end version.
I see two things the iWatch has that I think I'd like to have.
1) Apple Pay without having to pull out your phone.
2) A discreet and personal notification system using a haptic feedback interface.
I like the idea of not missing phone calls, being able to get notifications of important emails, txts etc from a gentle tap on my wrist.
I don't like being attached to my phone, I prefer to leave it on my desk or in my brief case when I'm out meeting clients.
In doing this I miss calls and messages that are important.
The iWatch, as I see it, is just a hardware extension of the iOS eco-system.
It's not a separate entity in it's own right as the iPad is separate from iPhone.
So as an app eco-system it doesn't make any sense and neither does this article.
Time wasting social media (FB, Snapchat et al) are piss poor examples too.
Facebook's got an issue with Apple right now (see Samsung patent case announcement today with FB siding against Apple).
So any comments coming out of FB towards Apple right now can be taken with large amounts of scepticism.
iWatch Killer App? I'd say it's already there in "Apple Pay".