The morality of contraception is an issue with many sides. It is a controversy that each individual needs to address and form their own moral opinion on. In the past, the Church has been historically known to make mistakes. Blindly accepting the church's message in Humanae Vitae is foolish because of the numerous holes in the wording itself and the alternative viewpoints. Whether or not the church's stance against contraception has expired in the eyes of God is something only He knows for sure.
Humans can only speculate.
A Challenge to Catholic Preaching . Professor Suggests Birth Control Implants for Poor Teens . Catholic Catechism . Overpopulation and Population Control . Unintended Pregnancy in the United States .