Posts like this shouldn't appear on this blog. Adequately considering the question requires a truckload of special knowledge that most visitors don't have and that is not associated with the topic of the blog

The point of the post seems to be that the physics establishment may be in danger of falling into an egregious (and maybe even obvious, from an outside perspective) group irrationality trap. That point is highly topical - it shows that even mighty physics is not immune to rationality breakdowns. String theory is probably popular because lots of senior physicists, who based their careers on string theory, take on students who want to study string theory, and reject students who want to study alternatives to it.