I put this thought on another thread but I really think this is a step to change the end time prophesy around.
TJ - I hear what you're saying but what challenges in authority is the GB facing from other "annointed". The power structure is much different today than it was in Russell's or Rutherford's day.
What do you think would happen if an annointed brother or sister persisted in trying to get the GB to change doctrine or even taught different doctrine or shared different ideas with their local congregation. They may be given a little more latitude than say you or I, but they most certainly would be talked to and if they continued, there's no doubt in my mind they would be DF'ed. Nothing in this has really changed that fact.
I agree that there is something motivating this change. And, it's not holy spirit or a revelation from Jehovah/Jesus/whoever.
They know that the 607 arguement doesn't work. You see how many changes they've made over the years to the interpretation of Revalation. If they move up the dates, they'd be able to generate more excitement and urgency. Sure, they'd lose a few but they didn't lose that many when they said the system was going to end in 1975 so I can't imagine they'd lose that many if they moved around the end time date now.
The single most important thing was the appointment of the FDS. Now that they moved it to just the GB, it's easy enough to say the GB didn't officially come into existence until (pick a date - 40s as some of their archieve series is saying or 70s when it actually came into existence). Now that the emergence of a FDS isn't until modern times and not a continous sucession of annointed individuals, then its super easy to push it past 1919.