I've run a big text adventure for thirteen years (at one point briefly it was the biggest text adventure!) and if there's one thing I've about managing a big online community in that time that I'd choose to pass on as a warning to others, it's this: remove the people who don't like being there.
Some folks just don't like the place, or they liked it once and they don't anymore, and that's fine.
You'd think they'd just go somewhere else, and most do, but some don't, and those folks are AWFUL.