To whatever extent business schools are replaced by something like YC, it'll be to the same extent that large businesses are replaced by smaller and more granular businesses generating massively more revenue per employee. That was more or less what I was hinting at with the battleship/dive bomber analogy. It's not that YC is taking the place of business school, or that the types of people who went to and thrived in business school will be attracted to YC. It's that creative people like hackers and designers will learn just enough business to handle it themselves and the types of people who get MBA's will have to learn to work for a living.