" I don't see them dropping the teaching altogether, but "refining" the significance of 1914 and talking less and less about it as being significant as time goes on. "
That is my assessment too, they have been trying to minimise the significance of the 1914 rubbish for many a year, by mentioning it only as a "given" for example, and stressing that regardless of that date and doctrine we are still in the "Time of The End".
They will continue that latter tactic, and hope that 1914 fades in to a dim memory, as did 1925 and later1975.
But that is the only the least of their problems, and can be dealt with later.
For now, we on the outside, and PIMO's, will wait and watch all the upcoming changes, and the outcomes. With interest and mild amusement.