"They could not be saved who, knowing that the Catholic Church was founded as necessary by God through Christ, would refuse either to enter it or to remain in it" Lumen Gentium 14With lots of Anglicans, and now with the setting up of the American Ordinariate, Episcopalians are becoming Catholics, many Anglicans are telling us "It is two way street, it goes both ways, just as many Catholics are joining us".
It is true, many Catholics are indeed embracing Anglicanism which indeed for Catholics who believe what Holy Church teaches about herself is indeed truly sad.
I have know Catholic priests who have Anglicans in all instances but one because they wanted to marry, the one instance was because he wanted a boyfriend.
Ultimately anyone who leaves the Church does so because he no longer believes what she teaches to be true.
Maybe it is a lack of honesty for some people not to leave.
Thanks to some American friends, there are some interest stories here of converts from the Church.