If 48fps is "more natural", then audiences are not in agreement. Most of the reaction I read about the 48fps Hobbit was negative. "Looks like a video game"
Actually I was rather pleased with it; supposedly the frame rate change in that case was supposed to ease the burden that standard 24fps 3D film puts on the brain. In that case I think it succeeded, but I wouldn't want to see the 2D version presented that way.