I don't think 1914 will ever be a problem for the watchtower. They don't need or even use proof to make significant changes. For instance we went from a biblical generation of 80 years will not pass away to the overlapping generation with no scriptural proof, and everyone gobbles it up in excitement. There was an article criticizing opposers who said the FDS will the leaders and not the entire body of anointed remnant. The entire article showed scripture after scripture proving why the FDS was the remaining 144,000. Fast forward a few decades and it's changed to the very thing that opposers said it was with no scriptural proof. Witnesses gobbled it up.
Results don't really matter to the masses. People like to be preached to, it's what makes them feel good. Witnesses latch onto these changes and flip flops because it's the only changes they actually get to see in their lives. Since the Great Trib never comes and therefor no paradise, the next best things are all the new understandings and books. It brings renewed excitement and joy to their faith as if NOW this new book proves how close we are. Rinse, recycle, repeat.
So as it pertains to 1914. All they really have to do is say 1914 was actually the beginning of pangs of distress but not the begging of the last days as we once thought. Blah Blah Blah, the last days are either still to start in the future or started on any event they pick, lets pick 9/11/2001 for now. All the witnesses would gobble it up. Of course a few would recognize the absurdity and leave, but not many that it would even matter. When 1994 came and went, the watchtower has not have a down year after. 1914 will just become an important date but likely 1919 will become the important date with the appointment of the FDS. With no real time attached to it, witnesses will go on merrily growing old and waiting.
