I don't think they even need to drop 1914. They've redefined the word 'generation' in a way which allows them to run with it for as long as they care to. They've gone from the generation which will never die to the generation which will never end.
Would large numbers currently inside notice to call BS on it? From listening to some inside talk, it's increasingly clear to me that many haven't really a clue on what they're meant to believe about some things. Just avoid looking anywhere but jw.org, parrot back the WT paragraphs on a Sunday and devolve thinking to the 7 old toads in Brooklyn.