Maybe. Ten years ago, I would agree entirely, but this is now, and things have changed.
Part of it is that conservative voters may get upset if, once again their goal of ending abortion is yanked away while they are in power. Conservative politicians have been holding this one back since Reagan days, never quite pulling the trigger. Maybe their constituency will wise up and realize that it is used as a wedge issue, and as such, is something that is not likely to get done, no matter how powerful the conservatives are in government. they may not appreciate being cynically strung along for political posturing while all these babies are being murdered. Or maybe they won’t and they will continue to buy the republican’s line that next time, we promise, really, that next time they control all branches of the govt, they will end abortion.
There is also momentum involved. Conservatives have been getting the things that they wanted. Regulations are dropping, leaving our environment, our economy, and our government at risk, but this is what they wanted. Racism is becoming mainstream again. Xenophobia is winning out with the party, not just illegal immigration, but legal immigration is being shut down. Natural citizens are having the validity of their birth credentials questioned due to the color of their skin. All the things that the party thought would be toxic to it, that would turn off voters, instead seems to be rallying them to their cause.
Overturning Roe would just be the icing on the cake that doesn’t have to be sold for a SSM because Obergefell is overturned too.
Progressives may turn out, but the problem with progressives is that they all have different ideas for the future, different goals and ways of achieving those goal, and so do not form a cohesive block in the face of obstructive competition well. Conservatives may not agree with much, but they all agree that, at most, the status quo should be maintained, and that preferably, things turn back to how they used to be.