I'll go with 1995 and the 'generation change'. The WTS managed to avoid total ship jumping after 1975, by keeping people fooled with the generation of 1914. Okay, so the end wasn't in 75, but it'll happen in the next 20 or so years. When that doctrine went belly up, I think it sent a ripple through the ranks. Not an outright revolt right away, but a definite sense of urgency was lost. The end was delayed. Why kill ourselves? Let's relax a little. And that allowed other interests in, which detracted from the World Wide Work.
Add to that the Internet, and suddenly all kinds of information and knowledge were at everyone's fingertips, it made it hard to cover up the failings, missed predictions, and downright stupidity of the past.