You guys have to understand that there is difference between Church discipline and small “t” traditions, and the Deposit of Faith which is big “T” Tradition with Sacred Scripture that Christ has entrusted to the Apostles who then entrusted it to the Church.
The Deposit of Faith cannot be changed, ever. Only Christ has the authority to change it, not even Peter or any of the 12 can change it.
Gay marriage belongs to the Deposit of Faith. Christ has said upon institution of the Sacrament of Marriage is that a man and a woman become one through marriage. Christ did not teach that a man and a man can become one, nor two women can become one in marriage. Therefore marriage only is between a man and a woman. And this is even supported by the Old Testament through Genesis when God created Eve for Adam. It has been God’s plan from the beginning, so there is really nothing we can do to change it.
Things like priestly celibacy is not part of the Deposit of Faith. Christ did not choose celibate men to become Apostles. Though Christ Himself saw the value of celibacy, He never required it. St. Paul further encouraged celibacy among the religious men and women (its not confined to the ordained, but those who live a life of service to the faith) but again never required it. So the Church can turn back on disciplinary actions such as celibacy anytime she wants.