The goals of the ARC is to provide the government with information and recommendations. The government can use all that to create or alter laws regarding mandatory reporting by institutions of abuse they know about, a joint redress scheme, etc. Of course this will take time....likely some years.
In the mean time, quite some JW abuse cases were handed to the police to investigate. These cases are likely to be followed up on.
But all of this takes time. Too much time for our taste of course....