Would the Watchtower have 'self destructed' if 1914 had been peaceful?
I think not. In 15. December 1913 Watch Tower, Russell republished an article from 1907 entitled "KNOWLEDGE AND FAITH REGARDING CHRONOLOGY which stated:
If our chronology is not reliable we have no idea where we are nor when the morning will come. Bishop Ussher's chronology, as we have pointed out (DAWN II., p. 51) puts the end of six thousand years nearly a century future and would destroy every prophetic application as we have seen and profited by it.
But let us suppose a case far from our expectations: 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. (Romans 11:12,15) What then? Would not that prove our chronology wrong? Yes, surely! And would not that 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 2300 days of Daniel, and to the epoch called "Gentile Times," and to the 1260, 1290 and 1335 days, the latter of which marking the beginning of the Harvest so well fulfilled its prediction, "Oh, the blessedness of him that waiteth and cometh unto the 1335 days!"
True: the world's affairs did not remain "serene". But there was no "Rapture", nor was Israel"restored" (especially not under the New Covenant). Despite the fact that this ' worked irreparable wreck to the epoch called the "Gentile Times" ', the WTS did not collapse, and the Society to this day points to Russell's prediction regarding the Gentile Times ending in October 1914 AS THOUGH IT WERE TRUE.