Tangentially related to this point, when tools like Rails came along, it seemed that web applications would become trivialized to the point where "anyone can do it". In an environment where anyone can be a web developer, do you need a web developer? It turns out you do, fortunately.

Now, Artificial general intelligence (AGI) is a threat to everyone's jobs, just about, but I can't see an AI short of AGI replacing a web developer's cognitive processes.