In the future, before I post anything, I will ask myself, "Will this post raise or lower the sanity waterline?"
Great! I'll explicitly use that heuristic myself from now on (if I remember to).
There could be a plugin for this. Imagine that before sending a post, you have to answer a few questions, such as: "Your certainty that this post will move the sanity waterline in a positive direction".
But we are only humans. We would learn very soon to ignore it, and just check the "right" answers automatically.
Maybe it would work better if it displayed only randomly, once in a few comments. And then the given comment could be sent to reviewers, who could inflict huge negative karma if they strongly disagree with the estimate.
Or perhap...
If it's worth saying, but not worth its own post, even in Discussion, it goes here.