I would claim that most teachers today are on amateur level. However, the teaching area is not the only industry where it is hard to find a strong thought. I think teaching today and in the future should be about fundamentals. The world is becoming so diverse. There is just too much information and specifics generated every single day, for a teacher to convey to a child. Therefore, a good education will consist in teaching the principles of thought. Most kids are not thought about thought. Once a child has learned to see the world in principles and patterns, it will be able to ignore all the noise and focus on the specifics that really matter.
However, it takes about 1-2 generations to introduce a new category of teachers. I don't think teachers will rewire their brains for that kind of relationship towards knowledge. There has to be some sort of an incentive (pain/pleasure) that will get the kids of today to gravitate towards the new way of thinking, and maybe some of them will become teachers in the future.

There is a possible shortcut, I have to admit. Who said that education has to remain in the schools? So, perhaps a new type of educating might take place from another source which will attract kids. This will have its own issues, for new sources are untested. In old traditions and institutions, there is a hidden wisdom and benefits, that are hard to see. Even if the tradition or institution is seen as oppressive. Removing it is desirable, but at the same time we remove some hidden benefits. This is why using reason for everything can be tricky.
However, I have to say that reason will be enough to determine if a teacher is hurting a child's entry into the world of knowledge.
I have used the Socratic method not just on teachers, but also on other professionals. Here is the fun part. By the 3rd questions, you sense that they know what is happening and they look for way out. So, this shows me that they are aware of their amateurish relationship to their profession. Hence, the insecurity. Watch for that moment next time. You can sense it or even see it in their eyes.
So, before you start walking around like Socrates and asking fundamental questions to a teacher, keep this in mind ;-) . They might outright call you rude.