One thing I noticed reading the original report/proposal for the Mayoral Academies is that it was first conceived as a set of regional organizations. That is, you might have four or five towns and cities collaborating on, over time, two or three schools. This makes a lot more sense than what they're trying to do now, with a statewide network.
The combinatorics of a statewide organization don't work. There are too many districts and too many parallel configurations. Imagine a network of seven schools representing 20 "mayors." It might kinda make sense if you were looking at it from the point of view of a suburb bordered on two sides by Massachusetts, but if you're the urban hub, not really.