The evidence gathered by the Royal Commission is part of the public record. If it applies, or if it can be shown to apply, it can be used as support. And at the very least may well point to similar information existing elsewhere which is directly applicable. More generally, I'd think that other countries will be looking at the conclusions and recommendations eventually to be given when formulating their own policies. Sensible organisations may well also look towards a 'gold standard' which may be provided by the Australians with this process.
I know nearly all of us here have left a background of total disengagement with the political process, but as Robert says above, some things about this we can help with directly from the outside. A mandatory reporting law, for instance, closes off that loophole for the JWs. So even a short message to your local politician representing you at national level can have an impact.