You don't think it would restrict them? It could have just the opposite effect and restrict them even more. In a service industry where you are essentially competing for business the customer is always right. If it does what you think, than I would be all for it. I just think there are just as many problems it would create. Enrollments could change drastically from district to district thus teachers would be following the population. The good schools would get the better class of students, and the others the leftovers and non concerned parents creating even more of a divide between the achievement of schools.
Hard to find good answers with this situation!
My question regarding class size was more of a personal one. Regardless of whatever was used to evaluate performance in the TN case, I think most parents would like smaller class sizes for their children. Especially in the elementary grades.