How does consolidating an industry improve its resilience? Unless consumers have all decided that they love the formula exclusively manufactured under that volcano, they're not going to find themselves in the same bind that they are in now.

Now, this is different than if a certain country controls a significant portion of the raw materials needed to make a good, but that doesn't apply in this case. Cows and grass are abundant in every nation. Protectionism effectively reduces their supply, thereby increasing our exposure to shocks.