Whenever one gets to the brass tacks of charter school enrollment and retention, charter advocates immediately point out that charter schools are blocked from outright selection of a student group through admissions: no testing, etc. So those concerned with charter schools enrollment have to explain other, legal methods of restricting the student population.
The fact that charter schools have been gaming the system for years generally doesn't come up. But now that even the New York City Public Schools - who've never seen a charter they don't like - are having to discipline their charters for illegal conduct in enrollment.
I don't think you can put this down to CHOICE.
In other news, I went to school yesterday and had my first how-will-this-ever-look-like-a-classroom freakout. I decided to stick with two cubbies rather than cleaning out a closet that has cubby hooks and fixed the pegboard on the workbench. Then I grabbed everything I had laminated and went home to cut it.