[ocdtrekkie]

Indeed. People still like to talk about the "post-PC era" becaust PC sales slowed. PC sales slowed because they reached a level where a PC remained "good enough" for an extended period.

Is the "post-smartphone era" coming soon?

As it is, the main issue with old devices right now is that most of them are Android, and basically unsupported. If the dominant mobile phone OS ever gets serious about long term support, sales will slow even further. Maybe that's why they haven't.