I am the author of the article. Indeed, I am a programmer, but believe it or not, I have also taught people. Thus, I think I am eligible to say that no, people don't need teachers anymore. Not in the traditional, preaching sense, anyway.

Please, don't get me wrong - the right role model is becoming increasingly more important than ever, especially, now that everyone is essentially talkign to a piece of software that conjures up words statistically.

What you gave as an example is illustrating this better than anything else - anyone could just spit out the course material, and students may still not get a word of what has been said. And then, there are others, like a late professor of mine, who would just ramble on the most seemingly random things in class, and would still make people show up, share their opion, defend their theses, and show that they've grasped the subject matter.

Yes, teaching is a skill - but one that no longer has to do with reciting over the course material.