There will be an exponentially bigger Internet, for sure. That's the IOT. But in the future, most things that are hooked up - the vast majority of things - are still going to be hooked up to most other things. Mesh networks will supplement the Internet, and sometimes be self-contained, off the main grid. They'll be used as pop-up networks for specific occasions like parties and disasters, or with a specific goal, like avoiding government surveillance.
Because of that, the emergence of mesh networks is a very significant development, having many potential applications in the CIP space, and apart from the title of this piece in VentureBeat, I do agree that you need to learn about them. So do I.
But post-Internet age? I don't think so.