I am afraid I can’t help you with either math or rhetoric.
If it saves just a few lives of utterly helpless and totally innocent preborn human beings, it’s already an improvement. That said, after Roe and until last year it is generally agreed that almost 65 MILLION of those humans were slaughtered in America.
However, as the decision does not outlaw abortions in our land, it seems likely that women who aren’t allowed to get one in say Oklahoma or Mississippi will be able to go to another state where it’s legal.
So, how your question is of any value is unclear.