Nah. That's a bad analogy. The film equivalent to BPM is composition (scene switch, montage) speed. Much better to think of 48 fps as going from ~ 40 kHz to 48 kHz sampling rate: instead of fitting more things into a movie, what you film has higher temporal resolution. Net gain, easy to downgrade with a low pass filter... People can even notice the change, which is more than you can say for 48 kHz MP3 to 96 kHz FLAC, for instance.