Were the Justice Department to accept the Tauro's decision as constitutionally sound and appropriate, as federal and some state officials did when the courts began to strike down discriminatory laws during the segregation era, this could be a breakthrough moment in the struggle for marriage equality.
OK, let's say the administration repeats that they believe the law is discriminatory, it is still the federal law until Congress acts.
After the administration's statement, then what? The ruling applies to Massachusetts only, and then what? What is the "breakthrough moment"?
What happens next?
This is one of those instances where people are going to feign ignorance of process and law.
The fact is until Congress passed and LBJ signed the Civil Rights Act, no amount of disagreeing with the status quo by LBJ and others meant anything. Action is what is needed, and it begins in Congress.
The only other alternative, until Congress Acts, is for the administration to appeal. They can do so stating their belief that the law is unconstitutional. This is a test case for the SCOTUS. That may or may not be appealing, but that is where an appeal would lead.
If not the courts, then Congress needs to act.