For me that is the thing that rubs me the wrong way. Of course once we have cut some thing, some thing else will grow. I am not for just leaving all alone for 75 years to see what happens. To manage we need to some times plant, some times remove. I am not sure anyone knows what is natural. If we do not have any untouched forest we can go by. I do however think it would have varied plants, with varied micro climates that promote habitat for wild life. If we consider man a natural part of the process, than man should not just say I took what I wanted from the forest, now who cares. It is my understanding of permaculture that man is part of the big picture and he should be part of the betterment of his/her environment.