Being a teacher is not just about teaching stuff, there are other minutiae and nuances at play here. Various researches and studies show that the human interaction(or intervention, if you may) is necessary even if the schools are using computers and online programs to teach their students. For instance, a computer cannot create a culture of excellence, promote leadership, motivate students or build a sense of responsibility among students.

Now to the interesting part of the answer, what if we can develop an artificially intelligent humanoid as depicted in the famous show 'Westworld'?

Well, in that case- Yes. But it is still a far fetched reality, although there has been some progress. You might wanna read about the Jill Watson HERE, an AI teaching assistant to Professor Ashok Goel at Georgia Institute of Technology. Students never knew that their queries were being answered by an AI rather than a human before Prof. Ashok himself revealed so.