[CookieMon]

> The one thing it didn't have was longevity

Wikis would come and go like mushrooms and I too was burned once, so I figured Wikipedia's data will never be abandoned and so have been using mediawiki for over a decade. Even if mediawiki is one day abandoned the migration tools will be excellent.

history, syntax highlighting, inline images, tables etc. Markdown would be nice - and there's an extension which enables that, but who knows if that extension will have a lifespan/migration-path like Wikipedia will.