"I disagree with your observation that "entering Anglicans will be conservative." True, some will. However, the entering Anglicans remained Anglicans until now and did not seek union with Rome when the Church of England authorized female ordination in '92. They didn't cross the Tiber in 1991 after the House of Bishops approved Issues in Human Sexuality, a report in which the Bishops accepted "committed and permanent" homosexual relationships for the laity. If these two issues--particularly Issues in Human Sexuality--did not lead an Anglican to leave, then why are they leaving now that women are being made bishops?"
I respectfully disagree with your point. Changing churches, particularly one that you've been in for most if not all of your life, is a significant change. People tend to stick with what they know. But people do reach "tipping points", and there is something of a group-think mentality. Folks take a look around and see what their respected peers are doing and often follow in those foot steps.
I'm sure you've heard the old saw of the straw that broke the camel's back. This might be the straw for significant number of Anglicans. It might not be. We don't know at this point.