I've discussed and refined the following short-term site change proposals with a handful of users, and now I'd like to open it to general feedback. This is being posted in /chat/ so more people are likely to see it. The rationale for each point is under it.
1. The bottom-up, user/mod-determined board structure is replaced with general moderation.
The point of the original user/mod-determined board structure was to allow users of Old Ponychan to create whatever board structure they wanted. The only two people who actually did that were Kady (who essentially came from voidchan) and the absentee anon (from soyjackchan or whatever) who wanted /mu/ to be created. Every other board is basically a legacy board with general moderation already, including /mu/ at this point.1b. with the exception of /void/.
/void/ is running well under Kady as it is, so there's no reason for moderation there to be altered.2. /void/ becomes the default location for porn, politics, and shitposts.
As someone stated, current /chat/ and /void/ have little actually differentiating them. This change formalizes the /b/ aspect of /void/. Porn and politics may still be allowed elsewhere with appropriate tags, but the nature of these threads would have to be appropriate to the board. e.g. /void/ might have a porn dump thread, whereas /chat/ might have a discussion about the porn being posted.