Contraception is already so cheap and readily available that making it "free" is unlikely to have much impact on the number of abortions. People either are, or are not, too stupid to obtain/use contraception if they don't want kids. Abortions are declining because of (1) state restrictions on abortion, and (2) shifting public opinion on abortion.
As to the contraception = murder point, I suppose some might believe that, but there's a pretty significant difference between preventing conception or embryo implantation and killing a fetus that, if not viable, has actually developed into some semblance of a human being with a heart, brain, nerves, etc. The silver lining of morning-after pills being available OTC and at hospitals is that it further reduces any argument for the necessity of abortion.