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Once a xxxxxxx is a "success" the decay seems almost inevitable.
Agreed. I have taken the liberty of changing the word charter to xxxxxxx above because it may be applicable as a general statement: Some have seen doctors, dentists, schools of all types, and other institutions follow this path from success to hubris and demise.

Some have observed that the presence of a balance of competing organizations may tend to sustain the length of time of true customer-oriented (or student-orientated, patient-oriented) service. To the degree this has applied to corporations, we have had strong anti-trust legislation, preventing the amassing of money, power, and control by monoliths. Some may ask whether what is needed may be more choices, not fewer?