I think there is more too it than that. Regretably, Ronald Reagan, who we all love and adore, had 3 picks for the supreme court. 2 of the 3 were duds. Only Scalia is in favor of dumping R vs W. Kennedy has maintained restrictions but wont overturn R vs W. O'connor was a total dud.
GHWB, gave us Souter! A Lib-Pig and Thomas, so he was 50-50.
So there is no certainty that a pro life President will give us the Supreme Court we need.
If R vs W is overturned, it goes to the States. So, there are maybe 5 states that will outlaw it.
Abortion will continue in the millions for as far as the eye can see.
If (unborn)life is everything, as this thread is premising, then it will not be ended by voting pro-life. (I am pro-life and have always voted pro-life).
The holocaust will continue.
You are correct; however, there IS a certainty that a pro-abortion President WILL give us a pro-abortion justice.
For a multitude of reasons, it is almost impossible to discern whether a Supreme Court nominee is pro-life, but it is very simple to tell if they are pro-abortion.