^ I believe you misunderstand what is being said.
What they are saying is that we are in the "post PC" era. 10 years ago the only thing that got on the internet really was the PC. Now, 10 years later, there are many other devices on the net. Phones, game consoles, TV's, tablets, etc. The estimate going forward is that more and more devices that are NOT pc's will access the net. Nobody said that nobody will use a PC. It just won't be the defacto device for many.