Yes, the internet has taken over the PC desktop as the "centre of action" - although the PC does still play an integral role within personal and business spheres.
How has the internet become the centre of action?
Not too long ago, most people browsed the internet on PC's alone, and thinking back, I certainly wasn't able to use the internet on my phone until around 2005.
The PC back then was the centre of "action" for all things related to the internet. It allowed you to browse the internet, play games, and do some online banking etc.
These day it's different.
How have things changed?
It's strange to think back a few years, when people only used PCs to browse the internet. These days you can do most (if not all) things you could do on a PC on a variety of different devices.
Mobile phones have advanced to a stage where they're now much more than a phone - capable of doing far more than simply making a call. They can also text, browse the internet, scan things at supermarkets, take digital camera quality images and much more.
Laptops allowed people to do their PC style work on the move, or from the comfort of their sofa. Tablets have now surpassed even laptops in their design, allowing people to conveniently take the internet wherever they go.
Everywhere you look, people are typing away on some form of device, usually to update a social media profile or snap an image to a stranger over an app. It's safe to say that the PC is no longer the centre of action. Sure, it still has its uses for home internet browsing and office duties, but the internet is certainly the real centre of action today, and the role of devices is to simply keep us connected and online.