Copyright is a legal fiction - it doesn't exist except by force of the state, and there's plenty of evidence that it has a large variety of downsides. I think it's entirely reasonable to argue for alternative methods of providing benefit to society that don't rely on having the state threaten people for you.
Or, in other words - the default state of things is that copyright does not exist, not that it does. It's on copyright proponents to prove that we have a better world with it than without.
Great software developers already largely make their fortune doing bespoke work for clients with a need for it. So do great lawyers, great doctors, great system administrators, great technical writers, and so on. This isn't a new idea.
