While it seems many don't agree with the article (as usual) I do. Developers are sitting pretty at the moment because the Internet in the greater scheme of things is brand new. It wasn't really until the early 2000's the Internet exploded in popularity and got a whole lot more complex. There is always some new hot language startups and companies are clamouring to use, every new language or framework seems to create a gold rush of sorts (Rails developers were once white hot property).
But the sad matter of the reality is, more and more people are learning how to create a website. And while little Timmy who knows HTML and a little CSS won't be taking your jobs any time soon, as the supply rises there will always be a plethora of small jobs that Timmy would be able to do leaving the few actual big and complex jobs for the many developers fighting for the job.
I personally think we are a very long way off oversupply in the development sector (especially web). My advice would be to continually learn as many new skills and techniques as possible so if the day ever comes you are at risk of being replaced by a WYSIWYG editor that generates the code for you, you might have a chance of keeping your job.
Software is a lot harder to automate for the moment, but with websites it's at the point where content management systems like Wordpress already make it easy for people from kids to senior adults to make a website without even having to touch a line of HTML, CSS or Javascript. Automated tools can only get you so far, we'll always need designers to design the look and feel of a website, developers with a grasp of modern web technologies and languages to program whatever it is that's creating the website to ensure its output is up-to-date.
I've been preparing myself now for the future. If automation does happen and it will, nothing can truly be 100% automated, but if it does happen, I'll be the guy running the automation stuff, not living out on the street because I was too naive too think it could never happen to a developer like me.
PS. Send some of those recruiters offering six figure salaries my way please...