Not really. A copyright protects the publisher, not the author; it protects the right to copy. When copying was expensive, it had some meaning; now, not so much.
Your economic analysis is a quite a bit off. Your statement of the law is even further off.
First, copyright beyond protecting the right to copy, assigns to
authors, the sole right to copy, distribute, to publicly perform a work, and to make derivative works. Authors get paid for assigning one or more of these rights to publishers. So to pretend that protecting copyright does not protect the author is just wrong. Publishers pay because the right granted by the author can be exclusive.
That's not to say that authors in some industries don't get the bad end of the deals, but without copyright protection, there would be no deal at all.
Secondly, the ease of copying actual makes the right to restrict copying more valuable rather than less valuable. The economics has been favorable to pirating or illegal copying at every time since Guttenberg. Despite the fact that people are downloading music with impunity, the music industry is still thriving.
Under a government which imprisons any unjustly, the true place for a just man is also in prison. Thoreau: Civil Disobedience (1846)
I believe that a scientist looking at nonscientific problems is just as dumb as the next guy.
Richard P. Feynman
If there is no struggle, there is no progress. Those who profess to favor freedom, and deprecate agitation, are men who want crops without plowing up the ground, they want rain without thunder and lightning. Frederick Douglass