It could be sooner than 3000 AD, or it could be later, but I am sure it will happen before the Lord returns in glory.  I just doesn't make sense for the Lord to return and find that the Church is still trapped in the patriarchal culture of the Old Testament.  By the power of the keys, the Church is entrusted to mediate all vocations.  Our Lord promised that the Church would do greater things than he had done.  After the resurrection, St Matthias was chosen by the Church, and all successors of the apostles have been chosen by the Church.  Why is it that a woman cannot be ordained to ve a successors of the apostles? 2000 years not doing something is no justification for never doing it. Old habits die hard, but it is not a matter of faith.  It is cultural, a new issue that the Church had never considered before, but the Holy Spirit can get the Church out of this prison.  We can see the process unfolding...

http://pelicanweb.org/CCC.TOB.html#CHRONOLOGY