I disagree. The PC era ended when the PC was no longer the dominant computing platform. We can argue on dates specific markets etc.

Eras are ill-defined, but if you can assert that we once were in a PC era, you must also accept a definition that allows, in principle, for an end to an era.

The dominant platform of its era is the one with the greatest user and developer person hours, sales volume, zeitgeist and so on.

We are in the mobile era.