The Court will get away with it, they always have. .
They have so far. But states need to stand up and point out that the constitution says judges are not allowed to repeal laws.
It is really impossible for the Supreme Court to enforce its decisions by itself. What if a state did not comply with the Supreme Court?
The Executive branch is the enforcement branch. They send troops, like when southern states refused to desegregate their schools in the sixties. The national guard was sent in to force them to do it.
I think churches are free to not issue marriage licenses but state governments can't override the Federal Constitution.
If they could California would have told the Scotus to take 'citizens united' and stick it.