I believe the greatest damage that can be done, has been done, the publication of the ARC hearing videos and evidence.
WTS has proven for decades that they do not respect laws of the land that conflict with their beliefs. As long as they believe that their laws, rules, and beliefs epitomize gods laws, rules, and beliefs, they will stubbornly resist, falling back on and being empowered by their history of resisting persecution. 99% of all current JW's will simply chalk up any adverse judgment or press to being satanic persecution. The best that can be hoped for is that the ARC videos and evidence deter new converts from joining.
If indeed new converts dry up, the religion will eventually wither away, imploding as age and years win out. The only hope for new converts is in third world countries without ready access to the internet. However, without new converts in advanced countries, the money will dry up.
The more investigations and hearings that occur, regardless of legal outcomes, the better. The more video and paper evidence that surfaces and finds its way to the internet, where it could seemingly live forever, the better the chance for exposure and negative impacts to WTS.
In short, if the reputation gets soiled and their true nature exposed, support wanes. When support wanes, money dries up. Without the money, WTS goes away. It may not be quick, but at least momentum has shifted from growth and moving forward, to contraction and moving backwards. This alone is encouraging to me, even though I do wish for a quick, total, and complete demise, especially during my lifetime and that of my parents, I just don't see that happening though.