Andrew Jackson is purported to have said (his actual quote is far less flamboyant), "John Marshall has made his decision; now let him enforce it!" The Supreme Court has ZERO enforcement power.
All Congress has ever needed to do was pass a law acknowledging the obvious fact that preborn babies are persons and that would be the end of abortion. Any subsequent Congress would have an incredibly difficult job of repealing such legislation because they would be faced with the impossible task of explaining why a baby isn't a person.
I agree that Congress could fix this immediately. I also believe it will require a 2/3+1 majority in the House and Senate to overcome a presidential veto, because repealing abortion will fly in the face of the selfishness of our era.