Show me a school where "the teacher is always right", it has largely been replaced with "the parent is always right".

The movie you link "Waiting for Superman" spends allot of time talking about the charter school movement which is not mentioned in your post. Arguably charter schools are an extension of "the parent is always right" motto as it is touted as giving the parent more choices. To talk about the decline of education and this movie without mentioning the role of charter schools is a disservice to the movie and the discussion.