It'd be interesting to do some contrasting tests to see what the footage looks like at both 24fps and 48 fps which is what Jackson & co. should've done. I'd also like to see what 48fps looks like on 35mm film as well as digital. I used to shoot 50fps super 8 film instead of 25 fps. It looked great on pans and fast motion but never videoish, but that is a smaller format.
A flat looking video image will never sell as cinema no matter how 'real' it looks.