You knew it was coming.
1) Is it a sustainable form factor?
If watch behaviour is any example yes.
2) Imagine how good it’ll be in five years
A real robocop kind of future.
3) The real question is, when will you buy into it, today or tomorrow.
I’ve been wrong before but the app marketplace is what will make it sticky. Like swapping tv subscriptions, 2 or 3 compelling apps will make you switch. They might be at launch, or they might be next year.