I agree with Nick's comments earlier in the thread: Five Fingers, though impractical for off trail hiking for most people, are a great way to prepare feet, ankles, and legs for extended trips in lightweight footwear. Unfortunately, these debates can turn to either/or propositions that are often more about ideology than science. You are either a mindless capitalist drone led into bipedal slavery by a syphilization bent on destroying your animal nature, or you are a barefoot revolutionary whose toe nails glow with truth, justice, and divine enlightenment. If only the course of human history could be so easily altered by footwear choices.
I've had good results incorporating Five Fingers into running and exercise, but not all the time or in all conditions. As Nick suggested, the lifestyle commitment necessary for them to be practical off trail, on long trips, is one that few can or will make. Nevertheless, they can help your hiking even if you don't wear them hiking.