Especially with the younger GB members now on board they can continue to claim authority over us as God's 'Faithful and Discreet Slave' and do as they wish with us until they they too pass away.
A lot of Witnesses and exes tend to think this way, but in doing so, they are really subscribing to the Society's teaching about a special anointed "class" limited to 144,000 members. Obviously, if all the seats are filled, at some point, new members must stop appearing. That would leave the Society's leadership with a vacuum that would need to be filled by members of the "other sheep". The problem with this scenario is that there really is no scriptural support for the Watchtower's two-hope teaching; the "anointed" are an imaginary class, and there is no actual calling from God being fulfilled. This being the case, new members of the "anointed" can continue to appear ad infinitum, especially since the only requirement for membership is that one declares himself to be so. In the absence of a major doctrinal overhaul, when the younger members of the governing body age and die, more even younger "anointed" ones will come along to fill the slots. All that will be needed is for the leadership to come up with a semi-convincing explanation as to why new members of the "anointed" class keep appearing, even though the call to that group was supposed to have ended in 1935 - but they've always been good at coming up with cheesy explanations.
I know a lot of people expect the Watchtower to become more mainstream, but I'm not entirely convinced that that will happen any time in the foreseeable future. These are people who have submitted themselves to a particular doctrinal stance, and I'm not sure the leadership has any inclination to change that. The theory has been, for years, that new members of the GB would come along after the old ones died off and make reforms, but we are now in that situation - a significant percentage of GB members are now of the newer, younger variety, and little has changed. The supposed "reforms" on blood and voting are just smoke and mirrors - nothing has actually changed from the viewpoint of those inside the organization. The problem seems to be that the existing GB members are very careful to appoint only new members who think as they do - which will make reform very slow, if it happens at all.
I'm not saying, of course, that reform could not happen - the availability through the internet of information that was once unavailable to the rank and file certainly provides a strong incentive for the leadership to make reforms. But I don't see it as inevitable. The alternate scenario that I see would be a shrinking of the organization to a much smaller core of true believers. The mindset of many, many JW's is that they will follow the organization wherever it goes, so no matter how bad things get, they will not seek other pastures. These are the ones who would form the small core - anyone who possesses the least amount of ability to think independently will eventually move on. The possibility of shunning may hinder that move (and if the shunning doctrine were dropped, I think there would be an instantaneous mass exodus - which is why they can't change it).
Now, of course, it could also go the other way, and they could become mainstream. When you have a group of mindless followers, you can pretty much lead them wherever you want to. And I have no doubt that if the next Watchtower had study articles explaining why Jehovah's Witnesses would now believe in the Trinity, hellfire and the immortal soul, that most JW's would walk out of that week's Watchtower study praising God and the organization for this wonderful "new light". Some might rebel, and decide that the leadership had become apostate, but I think the majority would simply swallow the change and continue to hang on. Again, you would likely see some shrinkage over time from such a move (as in the Worldwide Church of God, which is now about 1/3 of its original size after new leadership embraced evangelical theology).
So, no matter which way it goes, I predict a smaller Watchtower organization in years to come.