When my kids were in public elementary school there was a teacher that was so bad that most families who had children assigned to that teacher simply left the school. The administration was going through the procedure to get the teacher removed but it was going to take more than one year. They finally came up with the solution of having the terrible teacher become a "social studies specialist" and have her teach a few hours weekly to every single classroom in the school, thereby diluting her awfulness among the maximum number of students.