I think the arbitrary choice of 48fps is the problem. I know it's easier to down-convert to 24, but it seems 48 just isn't right for our eyes. The human eye can process about 60fps. I love the idea of more frames, but 60fps might be better, and eliminate the "fast-forward" jittery look.
If you believe 60fps is better than 24fps, I have a really hard time believing there's something about our visual processing that makes 48fps worse than 24fps.
I'm interested in higher frame rates, and want it to succeed. Perhaps 60 wouldn't be better either... but just settling on specifically 48 and saying "You'll get used to it" isn't the answer.