I suppose the first thing we would need to decide is whether a judiciary is needed, and if so how it would work in modern Wintreath which has many aspects not involved with NationStates. The old system was almost never used, so if we were to replace it I would hope it'd be with something both relevant and useful to the community in resolving IC misbehaviour.
Realistically Wintreath as a collective (NS RMB, forums, Discord) is as well-moderated as it need to be. The judiciary, then, would have no purpose to serve if it was intended as a place primarily to seek moderation judgements - say, something on the Discord was said, it caused an issue for someone else, they take it to the court to get the offender temporarily banned.
This happens in a more streamlined manner amongst Wintermoot and the ops team without the courts as a middleman. I also think petitioning for a judgement to be overturned is similarly more efficient without the court as a middleman. It depends on whether we want to create a use for the courts by making this process more transparent with an opportunity for both sides to present evidence at the cost of the effectiveness of the current system.
Perhaps the courts could be used for settling petty disputes, things that don't require mod intervention but nonetheless leave both sides of the debate with ruffled feathers. This would be a true jury of your peers situation, but I'm not sure it really justifies itself.
How could we bring RMB affairs into a more central role for the 'forum' Wintreans, or vice versa? Perhaps in situations where NS Wintreans have got a little carried away on the RMB, the 'petty disputes' court might be useful?
To be honest it feels like I'm looking for reasons to have a court system rather than
finding them.