I didn't predict it would fail, but I didn't predict it would succeed either. In my heart I couldn't think of many bigger wastes of money (maybe spending $1.5M on Trump's election campaign?) but frankly products from Apple I thought couldn't possibly gain traction have ended up leaping off the shelves.
The talk about the Apple Watch felt like the talk about the iPhone - which if you remember, when it finally came out, wasn't programmable, had a 7 hour battery, was stuck on EDGE, and in some ways was inferior to some of the better flip phones (which had apps, and SD cards, and you could Opera Mini on them, and the battery would last for days, etc.)
But it was a success, even in its crappy 1st generation form, and most of us who shrugged at the time feel like we probably shouldn't predict the impending doom of a new Apple product hyped at Daring Fireball, lest we be made to look stupid again.
I still don't see why you'd want a watch that requires you do more than glance at it to tell the time.