The author's proposal is neither necessary nor sufficient for educating the next generation of leadership in philosophy. It sounds like you think it's "problematic" if economists end up being libertarian. Why is that? Your point about regulation is misplaced: both under- and over-regulation hurt welfare, and there are many instances of regulatory loosening leading to better outcomes, e.g. in cryptography and air travel. Is your position that libetarianism is itself problematic and that education should stamp it out?
