If they do not go down before, I think the Collective Shift in human thinking will finish them along with all out of date belief.
(The following is written knowing it is a generalising view, there were and will be exceptions )
At one time "Man" could not comprehend the idea of Farming, they were just hunter-gatherers because the brain was not able to form and accept the idea of raising crops.
Fast forward to late 18th Century, the human brain could not conceive of the concept that there was no God in a real Atheistic view until around this time.
Fast forward fifty years hence, religion extinct, belief changed dramatically to what may be possible, but awaiting proof.
No WT, thank God. (Tee Hee, I said God)
The WT may founder earlier than some others, the individuals described by Elephant in the post above , forward thinking, financially aware etc etc, are simply not in evidence as being present within the W.T, they need talent like that to survive, I don't thinlk they have the talent to draw on.