Something that cleans out the atmosphere of Wiki, letting new growth flourish.  Right after it may look like a charred ruin, but eventually, everyone will move on and the green will grow.

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See the description of the Fall in CommunityLifeCycle, notice how QuickChanges has been added to this Wiki, what are the effects of this change and did it have anything to do with WikiMindWipe

Hopefully another, smaller fire will again do good. Thanks for what you leave in our memories that's cool Alastair.

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BigWikiFireOfDoubleOught, LemonadeTime, WikiSpringCleaning