Changing Canon Law and particularly the Pontifical Secret as noted here are critical factors in addressing this crisis to be sure. I think changing Civil Law though is even more important because it's through the Civil courts that accountability actually comes. 

I've mentioned this example a dozen times but I think it bears repeating. In 2015 when Francis actually did work with abuse victims to report 11 priests to the authorities in Spain to get them convicted, the courts successfully prosecuted them. But then the judge through out the conviction citing statue of limitations. So civil law in many countries have to change because it's through civil law that actual accountability comes. 

Also Marie Collins has gone on to say that given the systematic nature of this problem......it isn't wise to reduce this down to Francis alone. This is a global crisis decades in the making that he inherited. Unfortunately there is no way he can clean it all up in under 4 years.