Just to be blunt, since you asked about methodology. That has already been taken care of.
Basically, as the Bible says, 10 slaves were sent out to do business. Each did according to their ability. Some increased 10 fold, another 5 fold. But one slave buried the invested money, not even putting it into a bank to collect interest. (By the way, isn't it interesting banks charged interest in the 1st Century?!!!)
What happened was that slave was condemned. That slave, that "evil slave" represents the WTS. But its coin was given to the slave that had a 10-fold increse.
So on a spiritual level, the two largest underground sects of the JIOR (Jehovah Is Our Righteousness), those secret sects that make up the woman who is hidden in the wildreness, make up the "two witnesses" mentioned in Revelation, who have direct responsibilty for arranging things and overseeing details for the Christ. So it is to the largest sect that the "sheep" from the WTS are brought out. So the true JWs, who figure out the WTS is the evil slave and lying but who maintain their trust in scripture and God, are inducted into this large secret sub-JW cult. Some leave the organization, some stay to keep up appearances.
So that's God's plan for savign the sheep out of the organization. Now those who just leave and become atheists or find fault with the Bible and all that, that's another story. But essentially, those who would be saved out of the WTS, have been saved. So not to worry.
Basically, those who love truth and trust the Bible more than the Watchtower hear things and examine things and are gradually led down the small road, the cramped and narrow path as they search for the truth. Then when they leave, spiritually speaking, holy spirits shows them others who have also left spiritually. But its all secretive.
When Christ comes to separate the sheep from the goats, it is speaking of the WTS. He does not save the organization, but takes his sheep out, for "I have other sheep, not of this fold." So the true witnesses have been gathered to the secret house of the most populous of the "two witnesses", the slave that had 10-fold increase.
Maybe there is an effort to get the last few marked but for the most part most would be out by now.
Of course, when the WTS goes under, all their funds are confiscated and they are made illegal, that will not affect Jehovah's true organization. That's because they function as a secret society. They are not public. So they can't be destroyed or oppressed like the public WTS members. They will go on.
New truths? None needed. The faithful all have enough now to survive Armageddon. They now what is essential. That's why it really doesn't matter even if they believe the trinity, like Harold Camping, who Jehovah is using also to gather his sheep and announce 2011 AD.
Getting everybody on the same doctrinal page is too difficult in the amount of time we have as well as too dangerous, but not necessary either. Do't forget the "Good Samaritan" compared to the rabbi and the priest.
LS