It depends completely on your hiking goals, and your foraging skills. You mention survivorman. He does a good job of showing how hard it is to find food on your own without a film crew catching fish for you and letting you hit it with a stick on TV to simulate a catch. I have seen others go out with 20-30 snares coupled with years of experience and only come away with one or two animals at a time. So, in other words, I wouldn't count on foraging for food, only adding to what I already carry.