I would even think that the WT might quietly drop 607 BC while keeping 1914 without any other rationale. Just as it dropped the Great Pyramid and the former 606 BC figure which were its real calculation bases. And 1914 would just float on by being (1) the date of WWI and (2) "predicted 40 years in advance".
Isn't it wonderful, brothers and sisters, that in spite of the errors of his well-meaning servants, Jehovah led his organisation to such an amazing knowledge?
I'm not kidding. Should the WT do it tomorrow it would keep 99 % of its members. And the other 1 % it doesn't really care for.
that is my thought as well. once I wrote to a pro-JW site asking some questions about 607bce and their answer basically was that even if 607 should be wrong, the evidence (favourite JW word ) is that the time of the end started in 1914....