" the clients are all free to shop for the services of another provider". I don't even know how to respond to this one. What percentage of people can afford private school? Did you even read this? He resigned due to the increasing amount of government regulations and his lack of control over his own classroom. How many "private practice" teachers even exist? 10%? 5%?
"recognize that plenty of people like the current system just fine". That wasn't the point of this article by far. It was one teacher's experience, not an editorial on how everyone hates the system. But if you bring up the point, please cite your sources. Show me what government employed teachers like the current system just fine.
I really can't believe you referred to a student as a client. It just feels to me completely against the spirit of education.