Reddit and Hacker News both solve the problem of "how do you host a site to allow for political discussion?"
To get good debate, you have to curate a social community by effective moderation. You see it on reddit all the time -- some communities are utter trash, and some are much better. It's a social problem, not a technological one.
The hitch: making good falsifiable or verifiable predictions is tough and time-consuming. Evaluating and judging them requires even more moderation.
And let's face it: most online comments are not about advancing the public discourse. They're about getting a quick dopamine hit.
That is to say, getting multiple dopamine hits as you type a long comment and imagine people on the internet being impressed by a comment you wouldn't be motivated enough to journal about.
If you have a high rate of success predicting outcomes, it's likely you have a good grasp on events in that broad category, and your comments are likely more valuable insights on-average.
Maybe building that would be impossible because the bias of curators would fill it with strawmen etc.
Plato: The Republic
Aristotle: Nichomachean Ethics; and Politics
Thomas Hobbes: Leviathan John Locke: Two Treatises of Government
Rousseau: The Social Contract
Montesquieu: The Spirit of the Laws De Toqueville: Democracy in America
Karl Marx: The Communist Manifesto; and Das Kapital.
JS Mill: On Liberty (the classic Utilitarian Enlightenment work)
John Rawls: A Theory of Justice (A hugely important work on rights and principles of political decisionmaking)
Robert Nozick: Anarchy, State and Utopia (a right-wing / libertarian oriented response to Rawls)
Michael Sandel: Liberalism and the Limits of Justice (critique of liberalism and introducing communitarianism)