Even if the Society admits it and changes it, that's only a difference
of 20-21 years, so the Governing Body could just shift 1914 to 1934-1935
and say that World War II and Hitler was the beginning of the signs.
Problems include:
1) A 1984 WT which clearly stated it was not 1934 as 1914 was correct. Why did God's Organisation on Earth deny when his Son started to reign?
2) 1914 has been such an intense focus by the Society for 130+ years, that it makes God look like a muppet to allow his only Organisation on Earth to preach the wrong date - plus you have Deuteronomy 18:20-22
3) There are so many associated parts post 1914. Like 1919. They tie in the arrest in 1918 of the WT Directors and the subsequent release in 1919 to the fulfilment of prophecy. What about the 7 trumpet blasts of Revelation and the Cedar Point conventions. Where do you shift that to?
4) What about Carl Orloff Johnson's work that he sent in 1977 to the WT? He was disfellowshipped for pointing out 1914 was wrong. Many have been thrown out over knowing 1914 was wrong. Where was God's Holy Spirit at all their Judicial Committees? Why did God want a false date printed and why did he enforce that false date?
1914 is a millstone around their neck. They will get hammered for it (rightly so) for dropping it.