I think it was the Awake! magazine that used to have the statement in the inside of the cover that read: "this magazine builds confidence in the Creator's promise of a peaceful and secure new order before the generation that saw 1914 passes away". We know this ended in 1995 when the doctrine changed the meaning of the word "generation".
In 1995 this doctrine change actually got media attention. Many newspapers carried the story. I even remember someone cutting out the article from a local paper and posting it on the information board at the Kingdom Hall I attended.
That doctrine change bought the Watchtower some time. However, I think this will end up just like the Millerites of whom Charles Taze Russell based his beliefs. This was actually dramatized in the final episodes of the HBO series "The Leftovers" season two.
At some point the Watchtower can no longer kick the can down the road. This "Overlapping Generation" has an expiration date just like the original "generation that saw the event of 1914 unfold".