It's a one-dimensional argument that relies heavily on rhetoric. It's hard to draw any practical conclusions from such an argument. The point is mostly just to persuade you that file-sharing is good and anyone who opposes file-sharing is dumb.
The only practical conclusion I can draw about file-sharing is that it does not look like it will stop. Information sharing is only going to increase--that's what the internet was designed for. Publishers will probably need to focus on physical means of revenue that the internet can not inherently provide.