My biggest concern is small niche hobbies. There might be three people who share my interests on kbin and seven more scattered on other servers, if we can't find each other it'll be hard to do things on kbin alone.
Federation doesn't backfill, so it's going to be rough as most content posted during this blackout will never reach other servers afterwards, nor will theirs reach ours. So I'm actually holding off on trying to do more with the subs I want to set up until everything is running full steam again. I hope this doesn't last too long.