people can keep replying to posts even if the person is nop longer a member as long as the thread has not been deleted. for example if I left the site now and my thread called resourses was not deleted, after I am gone people can still use and reply to that thread. A person can be gone for years and still their thread can be replied to unless a moderator or administrator deletes the thread at the members request or because of breaking posting rules its here for life regardless of how long the member stays or is gone.