It won't happen without strong leadership from honest people.
Strong leadership is a potential weak link if they have a change of heart, get hit by a bus, move on to other things, etc., the Trust system is supposed to be largely self-regulating.
I think a better solution is needed to ensure some degree of accountability on part of those that are DT1 and also a different mechanism in place for others to be able to achieve DT1 level.
Enough people trusting/distrusting them will result in DT1 members being added/removed from DT1. For dealing with the worst Trust abusers theymos can still intervene manually.
DefaultTrust membership should mean your Trust ratings are accurate, that's it. Someone can be a trustworthy person but their judgement may still be subpar. Or they might not trade much with other forum members but they may be good at spotting scammers.
Vod’s trust ratings on me are 100% provable lies, yet he sits in DT1 even after theymos told him he would be removed for posting such lying trust ratings about me. How is this justified? Why is this allowed?
If that's case I think you may bring this matter to theymos and he can be removed from DT1 manually. For now theymos has just distrusted him.