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The size of the topic doesn't matter.
If the topic has run its course and the discussion has moved on to another topic.
It was precisely because of the latter that the decision to delete it was made...
Secondly, it couldn't possibly run its course (see the first sentence :)).
And thirdly, as far as I know, after a topic has run its course, it is closed, but not deleted.
If the topic has run its course and the discussion has moved on to another topic.
It was precisely because of the latter that the decision to delete it was made...