I hate deleting anything. One of the disadvantages: G2G contributors who answered these questions would notice their point scores going down. They got points for answering questions, when the questions are deleted their points for answering the questions would be deleted.
That said, deleting some here and there wouldn't hurt much.
Another thing we (Supervisors) can do: remove any surname tags from them. They shouldn't be tagged with surnames anyway. This would be the main thing they'd be crowding, I assume -- questions organized by surname.