Quote below of C T Russell in response to a question about the value of continuing to distribute Studies in the Scriptures post-October 1914.
He says the writer's question would be an "interesting matter a hundred years from now." By this, Russell was admitting (hyperbolically, since he never imagined in his wildest dreams this system would last anywhere near another hundred years) that his chronology and predictions would be proven false if not fulfilled by 2014.
(1915 quote follows after.)
Even more pointedly, Russell said his chronology would be proven wrong if unfulfilled by 1915:
[W]e have neve claimed our calculations to be infallibly correct...suppose that A.D.1915 should pass with the world's affairs all serene and with evidence that the "very elect" had not all been "changed" and without the restoration of natural Israel to favor under the New Covenant. (Rom 11:12,15) What then? Would that not prove our chronology wrong? Yes, surely! And would that not prove a keen disappointment? Indeed it would! It would work irreparable wreck to the parallel dispensations and Israel's double, and to the Jubilee calculations, and to the prophecy of the 2,300 days of Daniel, and to the epoch called "Gentile Times,"...We could still worship a God so great and grand that none other could compare with him. We should still see the grandeur of his salvation in Christ Jesus - "a ransom of all" ["Knowledge and Faith Regarding Chronology," reprint page 4067].