I'm not sure yet whether I think this is a good or bad idea, though this I'll say: HN is not just a news aggregation medium. If in the beginning it were, it is no longer. It is now much more defined by the people on here. Like reddit, the story pages give the majority of screen real estate to comments. It's not a stretch to say people on here drop by, to a greater extent, for the discussions, ideas, and tips - and to a lesser extent, to be exposed to a story or link that they might not have eventually found elsewhere.
I'm 100% behind you if they try to ban politics on HN. But for a week it's ok, we'll live and we may even learn something.