Ordination of women is bad enough  but women as bishops is and will always be a deal breaker in the eyes of the RC church.  (Bishops can ordain priests you see - a double whammy).  My husband is Anglican and I am RC.  His bishop is a delightful woman, full of wit and humour, who has shaken up her diocese from top to bottom, reassigned old hangers-on and put the lait in charge of the direction they wanted to go, re: the church.  My bishop, on the other hand, hardly ever goes out of the city limits, refuses to follow the more liberal of the pope's commands, in almost 10 years has yet to visit his more rural parishes, is only concerned about having photo ops in the diocesan newspaper,  requires the common folk to come to him, etc., etc.  If everything else were agreed to except ordination of women, there would be no agreement - ever!  It is the dealbreaker, ergo of primo importance.