I fail to see the problem with this last.... But I agree with you that a management-free school is not a panacea. The naive anarchist in me would like to think that by getting rid of the bosses and managers, all will be well. But of course there are many other bosses, in district headquarters, in the legislature, on the school board. Not to mention the baddest boss of them all: the one in the teachers' heads. Plus, even if teachers are in charge of the day-to-day operations of their school, the teacher-function, which is created by much larger social forces than principles, will remain the same.
Speaking of the teacher-function, I recently ran across this quote from Deleuze:
"We are wrong to believe that the true and the false can only be brought to bear on solutions, that they only begin with solutions. This prejudice is social, for society, and the language that transmits its order-words, 'set up' ready-made problems, as if they were drawn out of 'the city's administrative filing cabinets,' and force us to 'solve' them, leaving only a thin margin of freedom. Moreover, this prejudice goes back to childhood, to the classroom: It is the school teacher who 'poses' the problems; the pupil's task is to discover the solutions. In this way we are kept in a kind of slavery. True freedom lies in a power to decide, to constitute problems themselves."