Smartphone era definitely coming to a close
The problem space for smartphones is pretty much filled now. I just can't see what else you can do with the form factor, and I think we've seen indications of this with the increasing device sizes and phablets.
We're into the era of the interesting outliers (c.f. Lumia 1020). But the awesome thing is, this means we're due another technology revolution!
Not sure if that was sarcastic or not...