If the Church won't make real reforms willingly, then nation states (such as Australia, in this case) must impose reforms from outside.
Sad state of affairs. 
I write as one still clinging on, inside the Church. But I cannot blame anyone who has left (nor can I blame anyone who views me as somehow complicit for staying).
To answer your last question, then - Not many more years, in my own case. 
And of course the pews are no longer full. This scandal has played a big part in that.

Worth following the debates here in detail, I think. Daily transcripts. All parties seem to agree there is a problem. A cultural problem. The test will be whether anything significant comes out of all this. The Australian church seems to be pointing to a local synod in 2020. And so another three years will go by. But I doubt the Royal Commission will be fobbed off in that way. Let's see what it recommends.
We also need to see how a national Church can act, or whether it has to take its orders from Rome.