[dexy]

Landes & Posner also never advocated abolishing copyrights altogether... They just advocated moving to renewable terms instead of automatic 70 years to life.

Regardless of whether there is a decline in production, there would be a certain decline in production of high-quality, expensive content. If you think expensive to produce != high quality, you're wrong. Expensive content is only produced because it earns more money, and thus is better liked by more people. That's the only objective measure of quality I know.