Probably the sanest use of a community namespace would be for the migration
of all non encyclopedia-related categories like Babel, geolocation,
training, etc. a la [[Community:User en-N]] or somesuch. That way we would
avoid endless ramblings on what a "community" page is (not) allowed to have,
unclutter the encyclopedic category namespace and also be able to delete
community categories through standard CfD.