"Can't imagine?" I can't imagine you've been around long, I mean actually on the front lines of the war against abortion.
I can't think of one person currently active in the prolife movement who would agree with you.
In my own 40 years of experience, between 1/4 and 1/3 of the female activists in the pro-life movement are post-abortive women. They repent, they work through their grief, and they become activists in expiation of their sin.
A law which held these women responsible for homicide, would be (1) un-passable, (2) un-enforceable, and (3) even if enforced, would destroy the prolife movement.
Any law, to be meaningful, has to be enforceable; and no anti-abortion law will be enforced without dogged, relentless push-push-push on the local level. That "push" more often than not comes from conscience-driven people whose experience with abortion was up close and personal.
You are making two poor assumptions:
1) Those that received an abortion while it was legal, would face consequences.
2) That the consequence would be limited to only a murder charge.
While I believe that abortion is murder, the consequences may vary depending on mitigating factors.
So do what you have to do to advance the pro-life movement. But realize how much it is that we're not even fighting for any more.
FWIW, I have always, and always will, regard abortion as murder. But I won't let anyone know how crazy some of us pro-lifers are.