Earlier quoted context omitted.
Nobody's gonna buy devices that let them create in those ways anymore? Surely there will be demand for things to be created in the forms that those devices aren't good at creating for.
You're right, that was probably too hyperbolic. But I think the author's point is that part of his penchant for making is due to exposure as a child. In a post-PC era, even if professionals still have PCs, many fewer people will than do today, because they won't need them. That means fewer people, fewer children will be exposed to them as the author was. I think it's a valid concern.
I suppose I (personally) think it's generally inevitable (and even mostly good!) that machines continue to evolve the way they are doing now - "good" primarily because the newer types of systems provide so much more creative power to non-engineering types, which make up the majority of people.
But, as someone who is deeply interested in computers today primarily because of the power that was available to me as a young child on an early PC, I think that one of the most noble goods that can be done for the future is to provide tools to allow future generations to have access to similar capabilities for exploration and design like we had. The most obvious way to do so seems to me to be "open Web" tools. Web stuff that lets kids play the way we did in BASIC (hopefully even better!) seems like a really good thing to me.