What if the copyright period, instead of concluding at creator’s death plus 70 years, concluded after a period of 20 years since initial performance? Surely, there’s an imperative to create more content if it has only a “short” copyright period? And harmonizing patent and copyright law has got to have benefits.
Who writes software, or produces a movie, or writes a book anticipating income from their work more than 20 years hence? No one, that’s who. So, I’m going to go ahead and change the copyright duration.