Thighs Be Gone,
I'm not so sure about that. If you seek more "natural" movements, exercises such as squats and deadlifts are more natural and used in our daily lives than a pushup or a crunch, or even running 5k (after all, back then, you'd probably either run sprints from something dangerous or have to walk a very long distance)
Do we really need weight training? Well, if it were 500 years ago, probably not, since we'd be slaving away on a farm or gathering fruit. However, in this day and age, we tend to drive our cars or sit at a desk for 8 hours. Since our lifestyles have changed, we must adapt from our traditional form of "resistance training" (ie. lugging around rocks while foraging for food).
I would think that a true max effort in rock climbing certainly could be sufficient as resistance training if you hate the idea of weights.
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