Making such a change would also demand a changing of the guard with Ezekiel 18:4 and Eccl 9: 5 and 10, (immortality of the soul), no? So not only would the idea of a paradise earth be gone....but another staple of their core teaching (one they point to as being one of the "truths" that made Jesus select them in 1919) would disappear with it. Think about how many publications would have to be disregarded or re-written. Certainly plausible.....but I just can't see witnesses going for that regardless of how much "obey us implicitly" rubbish the GB throws out. I believe that 90% if not higher of all witnesses are a part of this religion because they want everlasting life in a paradise.....not because they love God. That alone is a selfish reason to "serve". If you take away their selfish prize I think you'll have a massive amount of sheeple that will suddenly learn how to think.
Since "the end is right around the corner" IS their teaching (as Cedars said)....I don't see how they can abandon it. I truly believe that they are in stage 1 of conditioning witnesses to live their lives in expectation of "the end" coming at any moment......yet also in stage one of separately getting them to accept that "the end" may not come in their lifetime. You may say that is impossible......but over time.....I think they can succeed. They've managed to get 7 million people to buy into the belief that God still speaks ONLY THROUGH them so the sheeple must obey all edicts if they want to please God....yet they must not get upset if the GB ends up being wrong because the GB don't claim to be inspired. If the GB can get the sheeple to buy into this provisional infallibliity theory then they can.....with time.....get the masses to accept that they may not live to see "the end".....yet still maintain eagerness. I think that within 10-15 years the teaching will be "The end is right around the corner. Can't you feel it? We are so close to the finish line, now is not the time to tire out! But even if time and unforeseen occurrence should befall us in this system, you may rest assured Jehovah will resurrect you in paradise! Imagine all the things you will be able to do in paradise! You can blah blah blah". I think they are going to start sneaking the "fact" that WE ARE ALL GOING TO DIE into their literature and talks. It will be prefaced by pleads to persevere in the time remaining and followed up closely by red herring paradise speak. JWs will focus on the need to keep pressing on.....and then focus on how lovely the "new system" will be without really realizing that they are being conditioned to accept that they will die.
I agree though. The internet is killing them. Regardless of what doctrinal methods they use....it is only a matter of time before negative growth sets in.