You know what they say; a joke is never old if you haven't heard the punch line before!
The revolving door of the Kingdom Hall is at work!
The newbie comes in the front door full of profound new "Truth" while the dejected and repressed ex-publisher is disfellowshipped out the back door.
The messege is kept "fresh" this way!
I use to live in Los Angeles where one of the local Oriental Rug shops has a sign permanently painted on his front window in bold and colorful letters that read:
GOING OUT OF BUSINESS (and in small letters) since 1958
The Watchtower Society needs to change its banner similarly:
WATCHTOWER going out of business since 1874