The point I'm trying to make is, that the protection offered by copyright extends beyond monetytization as it's often reduced to. (understandable in a capitalist econonmy, where Almosen everything has a price) Instead it allows the right holder to limit how it's distributed or attach conditions to the distribution. The GPL with its limitations on how I may use a piece of software licensed under it is one outgrowth of that. If you reject copyright, especially for digital goods, you should be fine with the GPL becoming useless.
You have a point. Yes, the loss of enforceable licenses would be acceptable in a system without artificial means to stop the flow of data. It's not like most of us have the means to go to court over GPL infringements anyway.
In what context? A laissez-faire economy without patents and copyright? You'd have to also eliminate law enforcement when it comes to licenses to render GPL useless, but I don't see how is this relevant to the discussion about the intrinsic economical value of digital data that can be copied at an almost zero cost.