The structure of leadership in schools is similar to that of a monarchy. The king's power was absolute as is the principal's or head teacher's power in many schools. This is because the very foundation that educational institutions are based is a socially constructed and so widely accepted model that reflects the hierarchical monarchies of the past.
Despite the lack of transformation of leadership structures into the 21st Century, the role of the Principal or Head Teacher has grown and more closely resembles the role of a CEO. They are responsible for marketing and image management, external performance evaluations and the running of the school as "business" on top of being the leading professional practitioner. It is also easy to understand hesitancy to relinquish power when accountability is higher than ever.
This discussion raises far more questions than it answers. While different educational models exist, they do not represent the norm and still adhere to an autocratic leadership model beyond the classroom. Who is to say that a transformation of leadership structures would transform education itself? My inner classroom teacher senses the potential for chaos while my inner educational activist says "giddy-up!"