I strongly agree with your main point and a number of premises, but quite a bit of this seems to built on false delineations and it looks like trying to create differences where there is not. I see no reason that the structure as you define it or the set agenda as you define it be necessary components in a course, for example. The method of reinforcing what you are learning is by far the most important bit, and the instructor may or may not be at the same level depending on the person. I can envision the existence of a legitimate course without an instructor, however, though I'm not really sure how it would really work.
But, as I said, I do agree that the instructor is a necessary component in the current state of things, which is one of the reasons the false points made me so sad.