Let me just say this: the "Abortion-on-Demand" crowd did not get where they are today in one fell swoop. Originally, abortion WAS allowed only in cases of rape, incest, or physical health of the woman. Gradually, oh so slowly, did abortion evolve into what it is today: anytime, any stage of development, any reason.
I for one would be more than happy to dial it back to "incest, rape, physical health of the mother". At a future time, we could look at dialing back those three as well. Increments, my friends, increments. Just as in the story of the little boy throwing starfish back into the ocean after a storm, he may not can save all of them, but "I made a difference to THAT one!".