A writer or journalist just can't make money if any huge company can package their writing and market it without paying them a cent. This is not comparable to piracy, by the way, since huge companies don't move into piracy. But you try to compete with both Disney and Fox for selling your new script/movie, as an individual.
This experiment has also been tried to some extent in software: no company has been able to live off selling open source software. RedHat is the one that came closest, and they actually live by selling support for the free software they sell. Others like MySQL or Mongo lived by selling the non-GPL version of their software. And the GPL itself depends critically on copyright existing. Not to mention, software is still a best case scenario, since just having a binary version is often not enough, you need the original sources which are easy to guard even without copyright - no one cares so much for the "sources" of a movie or book.