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.
Though, I heard some people say that scenes in old LOTR movies looked more realistic. This was mostly because Hobbit used more CGI though, for example orcs in Hobbit movies were all CGI but before in LOTR they had real actors to play orcs.
I personally didn't get that feeling either. Just got a feeling of "it looks better". Especially that dragon scene.
> variable framerate will become a thing
It already is a thing with slow motions, but it is not what you're thinking of.
Have you ever tried to do slow motion with a 30fps video? It doesn't look good. So your idea will probably look bad, inserting 24fps sequences in a 60fps movie will just look laggy.
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.