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You neglect to mention the fact that we are so used to seeing 24 fps that anything above it doesn't look like a movie. Why do home videos have that "home video" look? The biggest reason is the 60 fps frame rate - it just doesn't feel cinematic. Even the 48 fps of the Hobbit films felt too "lifelike" and not cinematic enough. A lot of prominent directors, as you've mentioned, say they'd like to move towards a world wi…
Is this a real concern of ordinary people? I am not a movie expert, just somebody who watches movies a lot and I have never thought to myself "this new movie with 48fps doesn't look like a movie, it's too lifelike, not cinematic enough". I assume people who think like that would be very marginal minority of movie experts. I don't believe average viewer would even think of such argument.
Personally I do think people will get over it eventually, especially for less "cinematic" stuff. Or possibly variable framerate will become a thing, and directors will choose different framerates for different effects.