People are going to wring their hands over admin-level, permiable serve blocks forever, but one of the things you can do with them as an admin is disconnect from Eternal September.
Obviously, general interest servers aren't going to want to do that, but more niche ones should be able to get away with it. And with some careful consideration for how blocks work, we can probably have environments where the good stuff reaches smaller, disconnected sites through intermediaries via cross-posting.