It would not be the legitimate “law of the land.” However, it would be the effective law of the land. Congress could take on the USSC. It has the right and duty to define what areas the court can rule on. The Congress can actually remove a subject from the purview of the Court. The Court’s right to pass on the Constitutionality of a thing as a final solution is a power the Court arrogated to itself without Constitutional authority.
The Judiciary has shirked its duty to the Constitution by not stopping the bad actors.