This does not mean that every copyright must prove its value initially. That would be a far too cumbersome system of control. But it does mean that every system or category of copyright or patent should prove its worth.
The real harm of term extension comes not from these famous works. The real harm is to the works that are not famous, not commercially exploited, and no longer available as a result.
The danger in media concentration comes not from the concentration, but instead from the feudalism that this concentration, tied to the change in copyright, produces.
So uncritically do we accept the idea of property in culture that we don't even question when the control of that property removes our ability, as a people, to develop our culture democratically.
Of all the creative work produced by humans anywhere, a tiny fraction has continuing commercial value. For that tiny fraction, the copyright is a crucially important legal device.
Now that copyrights can be just about a century long, the inability to know what is protected and what is not protected becomes a huge and obvious burden on the creative process.
Notwithstanding the fact that the most innovative and progressive space we've seen - the Internet - has been the place where intellectual property has been least respected. You know, facts don't get in the way of this ideology.
While the creative works from the 16th century can still be accessed and used by others, the data in some software programs from the 1990s is already inaccessible.