What Massachusetts decides to allow or disallow has no Constitutional bearing on any other state.
Congress and 37 states' legislatures already have passed laws intended to block recognition of other states' approval of same-sex marriages. Short of militarily conquering the United States Government and other states with the Massachusetts Highway Patrol, Massachusetts can not force any other state to recognize the legal validity of a Massachusetts same-sex marriage.
I'm simply puzzled you would post this less than a week after the USSC ran roughshod over the first amendment. The USSC will do what it wants; the full faith and credit clause will be the vehicle.