The fact that this is the first time in the history of the Catholic church that it can't get anyone to take vows of celibacy to serve it. Never was a problem in the past.
The precipitous devolution just happens to perfectly coincide with the late 60s, just when Vatican II befell us. Just luck of the draw I guess.
Part of the problem is that heterosexuals don't care to attend seminaries full of leftists who often treat the dorms as a bath house, just to graduate and go to work for an episcopal in the John F. Kerry wing of Catholicism.
I'm more interested in the solution to a shortage of priests and to the enrichment of the oriesthood.