You guys make it sound like I'm not allowed to disagree with a SCOTUS decision, even though they aren't unanimous. Haven't you guys ever disagreed with one of their rulings?
Sure, you can disagree. But you have to follow the law as they decide, and so does everyone else.
If this were a matter of only one decision on the issue of abortion, Roe v Wade, you could certainly hope that the SC would change and then overturn the decision. But it's not that easy.
First, Roe v Wade was not decided by a simple majority of 5 to 4, but by 7 to 2. Second, it is not the only abortion decision the SC made. There have been quite a few court challenges to Roe v Wade since 1973 on various different points. Hence, as the justices on the SC changed, there were quite a few cases the SC could have used to revisit Roe v Wade and overturn it. But in no case did the SC decision involve attacking the core of the Roe v Wade finding.
Notably, the Planned Parenthood v Casey decision was made when all of the justices were Republican appointees except one, and the one Democratic appointee had dissented in Roe v Wade.
It had no difficulty rejecting application of the first, second, and third trimester division in Roe v Wade, but it upheld the concept that fetal viability is the point at which the state's interest in protecting the potential life of the fetus is compelling enough to override the rights of the woman except for the rights to life and health.
It even replaced the standard of strict scrutiny against state regulations as obstacles to the woman's seeking an abortion with the lesser test of "undue burden." But it upheld the concept that the state could not make regulations onerous enough to be true obstacles to the woman's seeking and obtaining an abortion.
Furthermore, it acknowledged the basis for the doctrine of stare decisis, or the court's standing by precedent decisions unless some change in fact or understanding of the decision had come about, as the interests of a predictable judiciary were against overturning precedent simply because the particular justices were replaced by others.
That was not the only time an abortion case placed the court in a position to revisit Roe v Wade, but the court never revisited its core to overturn it. And with each new decision, more precedent was made, so there was more reason to support the core of Roe v Wade than before.
Furthermore, one of the most vigorous opponents of Roe v Wade, Justice Scalia, is not against Roe v Wade because he supports personhood for zygotes, embryos, or fetuses - though his wife is a noted fetal personhood activist, and if the issue came up to the SC, he might have to recuse himself from being part of deciding a related case. Rather, he is a states' rights judge, who thinks the federal government has no authority in the matter of abortion and that individual states should be recognized as having the final authority.
So even in the unlikely event of a changed SC to overturn Roe v Wade, the result would not be a federal ban on abortion, as most conservative justices have judicial philosophies which, if they did not follow precedent, would leave the matter to individual states rather than let the federal government impose limitations on the power of the states.
SC precedent, its strengthening by multiple decisions with different justices, the tendency for conservative dissenters there to favor states' rights over federal limits on individual rights and states' powers - the whole package bodes against what anti-abortion activists want. Add to that the fact that courts lower than the SC are obligated to follow existing SC decisions, so state abortion bans that legislatures might pass will just go on being struck down as unconstitutional in lower courts.
And the possibility of enough states ever ratifying a Constitutional amendment to ban abortion or establish personhood for fetuses is so low that anti-abortion activists aren't even trying.
So, no, a Supreme Court decision is not just an "opinion," or even a court "majority opinion." Just replacing old justices with new ones cannot change precedent or the reasons for following it.