I ( surprisingly) actually believe that the confessional seal should remain inviolable.
Firstly, because it runs the risk of casting child abuse as an issue that should trump any other considerations (which is increasingly happening anyway), my biggest concern is that it could lead to (as solo thinks should be the case) the eventual erosion of other forms of privilege, especially lawyer-client, and once it's done it won't be long before privilege of any description could be gone.
Secondly because I think that it might stop people confessing to a priest any crime, which then reduces the possibility that the offender can be urged to turn themselves in, and resolve things more peacefully. Obviously if they don't I don't think they should receive absolution.
I guess I just think that some principles are more important than crime prevention or punishment, in the same way I would never support torturing another human in order to get intelligence about a terrorist attack. And when I think of how I would act, if a friend came to me and asked for strictest confidence and told me they had abused a child I don't think I would turn them in.
/2c