What drives them? Money and Power and the Fear that they are losing it.
What is the GB? Figure-heads only. Lawyers and Executives run the company and set policy and doctrine.
Has it failed the flock? Definitely.
Here's my take on it for what it's worth. The old-timers, those that have been around since the 40's, 50's, 60's and before, those that are multi-generational Witnesses, will for the most part stick around till the "end". Some of these old-timers have nothing else but "The Truth" to live for. It won't matter what changes in doctrinal issues the WTS comes up with, these hard-core JW faithfuls will be there along with their check books, ever believing that it's because "the light is getting brighter and brighter and the FDS is dispensing the proper food in due season."
As they slowly die off within the next 20 - 30 years, the changes will have been made so gradually, and explained so slickly, that to us, looking back, the WTB&TS as we know it today, will be unrecognizable.
I think this is going to be accomplished through the tactics they have always used: Fear and Hope. They will continue to terrify their flock into thinking with each new revelation from the FDS "the end is upon us." They will continue to quote scripture like "he who endures to the end will be saved". They will use the "for JW eyes only" issues of the WT to continue their brainwashing techniques and maintain this "right on the edge" kind of existence for the flock.
But you can bet that they do follow the trends and carefully "listen" to what is happening. If they are losing as many members as we think they are, I can almost guarantee they monitor sites like JWD. It's probably done by company men that aren't really interested in being contaminated by apostate thinking....all they would be interested in is what is being said and how much influence it's having, and what changes they can make to WT policy to keep the $$$ from flying out the window!