A system which allows for complexity will evolve in unpredictable ways. Some economic and security models don't account for the variety, and have tried to solve the problem by constraining the system using trust & authority tools (like DRM). This (he purports) is often unsuccessful in its intended purpose, and the ecosystem's lack of unintended consequences removes its capacity to change.
I think it's an interesting argument, though he does let his feelings toward media companies color it. What it makes me think about is the negative consequence of over-engineering; maybe sometimes it's better to leave some unanswered questions.