In the absence of some ACTION by the American bishops or the Vatican, Americans, being people of action, rush to fill the void.
This is better than another reaction of Americans when they're filled with disgust, which is to just silently walk away.
I also think you could say "In the absence of some ACTION by the American bishops or the Vatican, Americans, being a people of instant gratification, rush to fill the void."
The most important action has taken place, most, if not all of the homosexual priests that are violating children, have been removed. What remains, is how to deal with the victims, the vile priests and how to make sure that those type of priests are no longer permitted within our ranks. That doesn't require "changing the church", IMO.