Quoting Nathan Awrich nawrich@gmail.com:
WikiProject: Burn Unit or WikiProject: Rescue? Mostly kidding, but I'm not sure that there is any specific action that can be taken to avert this sort of thing. Folks need to be adults and recognize when they are reaching their limits *before* they explode. If they can't do that, then it calls into question whether they are ideal as administrators. Every time an admin burns out violently and resigns in the context of an ArbCom case there is one less admin who isn't self-aware enough to remain an admin. Seems harsh to say it that way, but its true isn't it?
No it isn't true. Resigning in a huff in no way means they aren't self-aware enough to be an admin. In fact, deciding one has had enough and leaving in a huff is far superior to many of the possible alternatives such as massive abuse of the admin tools. Almost every admin that leaves in a huff is an admin who is a good admin and the fact they are leaving demonstrates that they are self-aware enough to know when they need an indefinite wikibreak.