I think this is just the usual scare tactics to make those on the fringes to 'straighten up and fly right' (or get out already), the studies to take a stand, and the already zealous to do even more. Same ol' same ol'.
(Parody: )
Early 1900's:
"The door of the Ark is going to close."
1940's:
"The door of the Ark is closing."
1960's:
"The door of the Ark is almost closed."
1970's:
"The door of the Ark has closed, but it's not locked yet."
2020:
"The door of the Ark has closed and locked, but just as the woman who banged on the door of the judge and finally got her right, people may do the same now."
2050:
"The door of the Ark is closed and locked, but the Watchtower can provide the keys - but you must hurry up."
2070:
"The door of the Ark is closed, locked and barred and it's started to trickle, but the Watchtower can show you a hole in the wood flooring which you can sneak aboard through."