I like the point being made here: building a product is hard. But once you've built it, you have a new mountain to climb: building a business.
In our startup culture, "building the business" is usually delegated to a new CEO, brought in from the outside. I don't think it has to be that way. Managing a business is hard, but it's just a new challenge. Founders don't have to give their business to someone else to manage.