Earlier quoted context omitted.
To have no rules is the simplest and most fair way for a creative professional to convert their effort into scarce attention, which leads to scarce resources. If you do not do anything new and worthy of my attention tomorrow, I do not want you to have my bread.
People should have control over their creations long enough to make it worth the effort. I might as well go do something more profitable if I can't make a living from my own creations in the way that's most efficient (licensing). Encouraging creation is the point of copyright. We shouldn't throw the whole system out just because a few rogue organizations are abusing it.
We don't actually know that it would enhance authorship. Current restrictions on copying also heavily restrict authorship -- because most authorship could have been derivative works, and those are disallowed.
So it is not clear whether we're helping authorship or destroying it, and I'm betting on the latter.
Also, authors have control over their works until they distribute them -- and that is enough to make money. Maybe it would make significantly less money, but that too isn't clear that it will not be enough to be worth the effort.