Then don't just sit on your hands. That would be your choice.
To suggest that anything other than federalizing the problem is sitting on one's hands is quite spurious.
If they outlaw it in Mass., they will find another state, and they will convince the court to enforce "full faith & credit" to "federalize" gay marriage. SCOTUS will ignore the Defense of Marriage Act, as it is mere legislation vs. "full faith & credit" which is in the Constitution.
You don't take a knife to a gunfight.