would be criminal prosecution by the civil authorities of all those guilty of the crimes and all those who conspired to cover them up and protect the perpetrators.

Given the scandal's international dimensions, extending no doubt to all six continents, and given that the Holy See is in fact an independent nation state, what we might need is something along the lines of a war crimes tribunal in the Hague, with the power to compel testimony and the appearance of defendants before the court.

As someone else said in response to my suggestions above--it's never gonna happen. Doesn't mean though that it isn't needed.

Edited to add: Where the hell is Interpol when you need it?