If they were going to drop or modify the 1914 teaching, they would need to ignore it and not mention it at all for a number of years, so that the rank and file forget about it. Then they can offer up new light and say that Jehovah has given them a new understanding through the holy spirit. They will word it the way they usually do- 'isn't it great that Jehovah has blessed us with this new understanding? How wonderful he truly is!'
No one will want to point out that this means that Jehovah was misleading them for more than a century. That kind of talk can get you in a room with three elders before you can say "apostate"! They will be forced to agree that it's amazing that they now have learned these new truths and look forward to facing the end of the present system of things, which is no doubt going to happen any second now.