It's likely (though probably not provable) that the Hyde Amendment led to fewer abortions than would have happened in its absence.
I think with the medical advances of today and the knowledge we now have the American people are now more than ever against abortion. The problem is the lack of political will from both sides of the isle. That, and the money to be made and the Sanger effect, the elitist idea that it’s the “undesirables” of society that are being aborted, is why it isn’t being stopped.