I'm interested to see how it evolves!
I've been a big fan of ChangeMyView(https://www.changemyview.co/) and Intelligence Squared (https://www.youtube.com/user/iqsquared) and this seems like potentially a great combination of both!
I think polling people before the debate to get the "initial odds" and then after to see how the consensus has shifted and combining that with some sort of score like CMW does would go a long way to advance the gamification!