I'll just say this: I believe that marriage is a fundamental right, whether it is same sex or not. But I will also say that the subject of marriage is nowhere found directly or indirectly in the Constitution, and as such the Court has to be very careful about declaring it to be a constitutional right. It is however a foundation factor in American society, indeed every society and as such IS a fundamental right and as such ought to be treated as a constitutional right. That being so, I do not see how any law that forbids same sex marriage can be allowed to stand in the face of the 14th Amendment, equal treatment before the law.
If Justice Thomas wants to review past court decisions regarding marriage, that's fine but I doubt that SSM will be overturned as a constitutional right even if it isn't specifically referred to in the Constitution. That's because the institution of marriage is in fact an integral part of American life and traditions and so is the requirement to equal treatment. IOW, I don't see how the court can say SSM should be treated any differently from traditional marriage if I may call it that. So, the Court may look at the issue again, but this time I suspect they will not declare that SSM isn't a constitutional right.
That said, the conferring of a constitutional right on a given issue ought not be up to 9 unelected people, if it is based on such flimsy logic as Roe was. I do not see any way in the world that a right to an abortion follows from a right to privacy, which itself is somewhat tenuous in itself. If the Court decides to look at future cases regarding SSM or contraceptives on the basis due process and the right to privacy, so be it. IMHO, it should fall to the US Congress to legislate such matters, including abortion, so that those issues are a matter of law without a Supreme Court ruling. Because otherwise it should fall to the states to decide for themselves, and that is exactly the way our system of gov't is supposed to work.