Good question but don't forget there is the upcoming adjunct to the inquiry where the WTS will have to answer these criticisms. Perhaps their response to this will influence any possible further actions.
The question is if the government feels there needs to be any change to legislation to force policy change in the WTS. I doubt policy will change just because the WTS is weak in certain areas but if the ARC recommends legislative change to enforce best practice across many organisations then I suspect it will be enacted at some point.
Certain states in Australia already have mandatory reporting and I would see this as the #1 candidate for federal change. The other possibility is that some rule may be enacted to force elders and servants to undergo criminal record checks. I don't expect the law to change to force Witnesses to do much else since so much of the process is ecclesiastical and Western governments tend to keep away from enacting legislation that would affect religious freedom. You only have to look at the legal complexities around thing like equal rights and homophobia to see how difficult it is to enforce social progress over religious tradition.