The organisation has too many other dates related to 1914 (e.g. 1919, 607) to move it or get rid of it.
If I had to guess, they'll simply keep extending the meaning of generation, and reiterating "the end is even closer now". I've already heard talk along the lines of "a generation was 600+ years in Noah's day". At the same time I suspect they'll fade 1914 from literature over the next decade or two. The end result being 1914 simply never gets mentioned, but is never officially depricated.
As new generations come through the organisation and don't get taught the 1914 doctrine they may drop it.