I don't mean like suddenly shutting the servers down without warning, but it would be nice if once or twice a day the system would say "We're going to log everyone out in 20 min to reset logins."

I mean, that would give everyone a fair chance to play and kick out people trying to stay online while AFK. It might be every four hours or so, but at least that should give more players a chance and/or encourage people to log when done. I think the more people can't get into the game the more tempting it is to say logged in.