Isn't that because that entire area of work (Wordpress blogs/basic websites/basic webfronts/etc) has been supplanted by Squarespace and all? Web documentation and tools have also gotten vastly better in the past few years, thereby allowing more people to get into the web industry, which then leads to a glut of supply while demand remains the same. I can hammer out a semi-functional webapp in a weekend now with backend in Meteor with a UI in React, whereas if I wanted to do this ~5 years ago I probably would've been stuck writing my own UI on top of Rails. Your article frames it as a bad thing, and I'm not sure it is a bad thing, it just means that demand has shifted to higher, more specialized web developers.
