indoubtbigtime
If they ditch 1914, they'll have to ditch the Gentile Times prophecy, and the Last Days in general, but JWs without eschatology have no reason to exist. An alternative would be to just move End of Gentile Times to another date. They could for example accept the historical consensus about the fall of Jerusalem in 587 BC; that would give them 20 years of breathing time, and pass the hot potato to the next generation of GB; this sounds cynical enough for the GB to adopt. The problem, though, would be that every WT magazine has constantly fired against the historical date of 587 BC in favor of their baseless 607 BC. Changing that would be a huge flip-flop, but it wouldn't be news.
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What you fail to realize is that the modern-day Church is an Eschatological Church or Organization as described in detail in the book of Revelation. Thus, such teachings or doctrines such as the Gentile Times, Last days, Parousia, Kingdom are all part of modern Biblical Theology fully developed by Jehovah's people since the days of the Early Bible Students.,
Then is no historical consensus for 587 BCE as the date for Jerusalem's Fall as most reputable scholars prefer 586 BCE thus 587 BCE is not the historical date but 607 BCE is the only validated date for the destruction of Jerusalem based on the historic Jewish Exile of 70 years.
scholar JW