No. They are not dead at all. The republican base will blow this one under rug like they do any other explosive issue. I think you are underestimating how far they will sink to be apologists.
I think that a portion of the religious right base are sincere. Bugf*ck nuts, but sincere.
Unless the repubs can spread the blame around, and I think it's too late for that and I don't think they can do it anyway, I believe it will hurt turnout in that part of the base Tiana. We'll see if I'm wrong.