I wouldn't participate in any voting or elections if I know that results won't significantly change anything.
This is the crux of all politics... getting people to believe that their vote matters. Somewhat ironically, the fewer people that vote, the more their vote matters.
First improve DT system, than ask people to join or leave.
I'm curious as to how you would change it. I think its set up reasonably well, but perhaps what's more important is its a vast improvement over the old system.
I've seen several suggestions, and my favourite is still to require more than one DT1-vote to reach DT2, but I doubt there's a perfect solution.
I like that.. maybe 2 or 3. Would make trust padding more complicated. According to your lists in Meta, there's well over 600 DT1 + DT2 members in any given month. Perhaps that's too many.