Let it be clearly understood that the overlapping generation doctrine came about and was created by the acknowledgment that " This Generation " from 1914 were dying off.
It wasn't created by new light given through holy spirit in other words.
Will the leaders of the WTS (GB) change up this doctrine in the future when the overlapping generation starts to die off ?
.........you can count on it
or will they drop 1914 all together ?
that remains to be seen, a slight possibility.