There is now considerable evidence that this 30 year cycle will once again repeat itself approaching the year 2034. This is when 120 years will have passed since 1914. Genesis states that 120 years warning was given to Noah prior to the deluge. In Matthew chapter 24 verses 37 – 39, Jesus is recorded as saying that the end of the system of things would be "just as the days of Noah". There is evidence that the 2034 date is gaining traction among various JWs, as it is a date of "great prophetic significance".
Could you elaborate on the evidence? I remember an Awake!(?) article about 3 years ago that mentioned 120 years. That's the last I've heard anything.