Clay Shirky has a long and fascinating post on complex business models that outlive their purpose and ultimately doom the institutions that birthed them. On internet economics:
When ecosystems change and inflexible institutions collapse, their members disperse, abandoning old beliefs, trying new things, making their living in different ways than they used to. It’s easy to see the ways in which collapse to simplicity wrecks the glories of old. But there is one compensating advantage for the people who escape the old system: when the ecosystem stops rewarding complexity, it is the people who figure out how to work simply in the present, rather than the people who mastered the complexities of the past, who get to say what happens in the future.