Can we call these what they are? Reddit Ghettos.

They're going to round up all the undesirable subreddits, put them in ghettos, then starve them by denying them fresh users, votes, and opinions via /r/all.

Also, I'll bet my next paycheck that the mods in the defaults are going to institute deletions and bans if you link to any of the verboten subreddits, further deepening the rift between admin-approved opinions and the forbidden thoughts. It'll get so bad that there'll need to be separate channels just to discuss the people in the ghettos. Established users will chill their own speech, and fear setting foot in the ghettoized subreddits, as they know the SJW bots will hunt them down and mark them for automoderator persecution.