Since either the Senate or the House can initiate a regulation to govern the appellate jurisdiction of the Supreme Court, and since such regulation(s) can be adopted by simple majority vote of both Houses and are not subject to a Presidential veto, why doesn't Senator Cruz introduce a resolution saying, "Effective immediately, the Supreme Court may not hear cases on appeal from State Courts, either directly or from Article III courts, concerning marriage"?
That seems easy enough, and doesn't require any constitutional changes.
> "Since either the Senate or the House can initiate a regulation to govern the appellate jurisdiction of the Supreme Court, and since such regulation(s) can be adopted by simple majority vote of both Houses and are not subject to a Presidential veto, "
From Article III, Section 2.
... the Supreme Court shall have appellate jurisdiction, both as to law and fact, with such exceptions, and under such regulations as the Congress shall make.
The term 'regulations' is a result of laws passed by Congress and signed by the President. I think Obama would veto any such law.