I would point out to the people pushing this that it's a great way to chase people away from teaching in Massachusetts ever. I would point out that young people interested in starting a teaching career might favor a state where that career can't be snuffed out because of random fake data that's beyond their control. I would point out that this is one more policy that will almost certainly make it even harder than it already is to recruit teachers for high-poverty low-achievement schools. I mean, most states are settling for evaluation systems that punish inner-city teachers with just losing that particular job; it takes big brass ones for Massachusetts to say, "Come teach in a poor struggling under-funded low-resource school. Take a chance on the job that could end your entire teaching career before you're even thirty." Who on God's green earth thinks this is a way to put a great teacher in every classroom?
Also, go read Janice Harvey.