The intent of the split is not to prohibit discussion of cluster 1 topics in culster 2 board and vice versa. Mods might get anal about the division of topics, and that would be a true loss since it's not super important.
I called them "clusters" because there's no clear boundary, and it is more the case that the /world/ board is a subset of topics from /leftypol/ that have a vaguely similar theme.
I don't know what to do to revive the /edu/ board, besides this idea. If you have any idea, I'd love to hear it, even if it's a far fetched idea. The goal here is to make less popular topics accessible to those who are more interested in that than in geopolitics. The first pages of a board are prized real estate, and the intent here is to double it, basically. It's obviously not that simple.
Also, in general, I'm very in favor of temporary experiments (like this two week one I'm proposing now), which I know for a fact many are not. Personally, I think we (as in the whole community) are too rigid and could do with making things more dynamic and changing constantly as situations change through experimentation of rules and moderation.
Thanks for the feedback. It's true that the overboard basically makes board distinctions kinda useless.