The Organizational heads have the ability to jettison any teaching they want at this point. Earlier in the organizations history letting go of 1914 might have been a problem, but over time the Governing Body has created pegs of persuasion that keep you held down like a well spiked tent and you'll be able to stay in your congnitive dissonant state.
An example is the phrase "A perfect, God lead, organization run by imperfect humans." - Quite a few Governing body members said this phrase at Circuit and District assemblies that I've attended to shore up the reasons why the information has changed over the years. This removes all kinds of psychological responsibility. Since no one claims responsibility as an author for the Watchtower articles, if they dumped the teaching, who would you claim to be responsible? You wouldn't say its God, because He's perfect and you can't blame the Governing Body because they "say" their imperfect slaves just like you, following Jehovah's will. So the change is simply just a correction in our thinking.
Another peg that'll keep a lot of people in is that Watchtower Organization will reference only what they've said to prove their point and then tell you what to specifically research. This creates a phantom "Ah ha! I see" moment for a lot of people. When they look into the older articles, they feel that they're doing DEEP meditative research and it lets them feel good that they're "discovering" this information on their own. So when they read it, its almost automatic that they'll find a justification for themselves for the dropping of 1914.
One other thing is the threat of "Not keeping pace with the Organization and Jehovah's chariot." This is a big one in my opinion, because this one is seemingly based on scripture, the vision of God's chariot that Ezekiel sees. This chariot, explained by the Watchtower organization, sees and changes directions quickly and easily. They have frequently asked the question, "Are you keeping pace with Jehovah's chariot?" , "How does being independent cause people to not keep pace?" and so on. The fear of being "left behind", not only in knowing whats going or or even fearing that being "left behind" might mean your death at Armageddon will keep a lot of people in the Organization.
There are a lot more pegs that keep people pinned into the Organization. So i dont think they'll be a mass exodus, they'll bleed a couple thousand people and families will split up. But all the Organization will have to do is relate it to a biblical incident and boom, those that left are now apostates ready for destruction and those that stay can smile tomorrow because they have a clean, dignified and closer position to Jehovah and salvation.
Thats my opinion