Scalia has often denounced majority holdings in extraordinarily memorable language. But what he offers in his two dissents at the end of this term are much graver charges. The ruling in King further infantilizes Congress, releasing it from its responsibility to craft laws with any precision, thus weakening the ability of the people to govern themselves through the legislature. And the marriage ruling more directly asserts a judicial supremacy over the people themselves. What Scalia is saying is that the court has corrupted the American form of government and staged a coup.
If these are anything more than rhetorical flashes, then it must make him wonder if he wishes to be a part of an institution that is this corrupted and corrupting of the republic. He may steel himself, as someone who will dutifully carry out his appointed role. But waiting for a Republican president to replace him is a guarantee of nothing. The two opinions that amount to a putsch were written by justices appointed by the two most conservative Republican presidents in living memory.
Progressives would be so giddy at his departure. So what? If the court is captured by politics, what better rebuke than to demonstrate that one justice is not so captured. Leaving the court would not relieve its members of the duty of upholding the Constitution. Let the burden and the obloquy of the putsch be on others.