I would say that they could have gotten away with changing 1914 up until they had that whole
1975 disaster. After that, perhaps they could have gotten it in slowly, adding it to "why we
were wrong."
Since they didn't admit they were wrong then, they have monkeyed with the doctrine too much
with little "patches" to go back now and scrap the whole basis for their current teachings.
They kept expanding what the "1914 generation" meant until even the babies from back then
would be too old, then they changed the "generation" twice since then. They have said that
all this "evidence" is the sign that they were right about 1914.
Few JW's understand the complicated reason why 607BCE is important and the "day for a year"
stuff, but they do know that WT literature swears that 1914 was that pivotal year and that the
Watchtower Society was chosen as God's only representative on earth, shortly thereafter.
We live in a time where Christianity is openly questioned by fiction like "The DaVinci Code" and
facts like the "other" Gospels. The internet is a common tool throughout much of the world.
It would be bad timing to abandon the core doctrine now. They have to work through this tough
period and find another way out. Even JW's will spread the news that WTS is losing it's "spiritual
blessings" if they make such a drastic change now.
I think they will hold fast to 1914. I did the calculations once for revisiting the 1975 teaching. Their
1976 excuse was that they didn't know when Eve was created. Well, they know that Adam was 130
when Seth was born. That gives them a little under 130 years past 1975 for the end to come. In that
time of 130 years, Eve sinned and had at least 3 children (Cain, Abel, Seth). They can claim that Eve
was awefully young (created as an adult) and very fertile. She could have been created just under 128
years after Adam. That places us into the year 2103 for the end to come. Except for a few children,
every JW now alive will be dead by then. They don't need to abandon any 1914 doctrine until at least
2103.