This matter is much bigger than Pell.
Yes, agree. There is certainly the appearance (at least) of systemic sexual abuse of minors in the Catholic Church.
Whether there actually is or not is difficult to say, as the fact that it is priests or laypeople performing the abuse tends to amplify the level of media attention. Some reports have the rate of abuse at or below the average for the wider population, some have it massively higher (depends on the place, time and details of the research).
The Catholic Church has certainly not helped its case though, as it systematically (in the US, Canada, UK, Australia and Ireland, at the very least) and actively avoided reporting sexual abuse cases and shifted priests/laypeople to new diocese, which allows them to re-offend. The church has also been very active in not just defending itself against sexual abuse claims, but going after some of the victims with counter suits and playing cases out to avoid paying out settlements.
It will be brought to a close when the church is dissolved, its assets seized and distributed to its victims, its leaders tried for crimes against humanity, and the Vatican either converted into a publicly owned museum, or bulldozed.
Here's where I disagree.
While the Catholic Church could certainly do with an institutional shake-up, and elements of the Church have certainty acted criminally, the Church is still a tremendous force for good.
Yes, there needs to be proper recompense to victims. Yes, some Church leaders need to be prosecuted for their actions. And, yes there needs to be massive changes in some areas.
However, I disagree that the dissolution of the Church, or the mass sell off of its possessions and mass prosecution of its leaders are a good thing.
You can cut out a cancer without destroying its host.