Sure, his analogies fail at some point, just like most analogies. But that doesn't make his point invalid. Or yours valid, for that matter.
The problem still remains that his time is scarce -- no matter how easy it is to copy the media he uses to distribute his work. And that's what copyright is about: Not the scarcity of the media, but the scarcity of the time needed to create the master.
Or can you snap your fingers and have beautifully designed, perfectly written, and bug free software appear on your hard drive?