My first computer booted into a BASIC interpreter. That was pretty awesome, and gave me an early window into programming. On the other hand, it didn't have a lot of things. It didn't have a text editor. It didn't have anything other than a BASIC interpreter. I knew that the games I played on that machine weren't written in BASIC, but I didn't know where to go to learn how they were made. My current computer, made by…
I think the author's point is that the post-PC era implies that the golden age you're describing is dying, replaced with a clean future, wherein people don't have computers with text editors and that can run interpreters and compilers etc. The children of the post-PC future will only have access to iPads. Or Kindle Fires, as pure a consumption device as I can imagine.
Why would you think that would happen?
And while I'm at it, why is "consumption device" an insult? Books are consumption devices. Nobody sneers at a child with a book.