Ultimate appeal
[Augur] Fork into multiple chains, one for each outcome to disputed case
[Kleros] Kleros general court
Why not have Kleros use the same mechanism of allowing dissenters of general court decisions to split off and make their own fork? It is a good way of dealing with global 51% attacks, as it ensures that if a successful 51% attack leads to the wrong answer then that particular system can get easily outcompeted by a clone that has more honest stakeholders.