It's a ridiculous argument, first of all that $5 would deter anyone, secondly the clang/llvm binaries are available freely, which is the default compiler in Xcode.
http://llvm.org/releases/download.html#2.8
GCC is freely available in source form.
http://llvm.org/releases/download.html#2.8
GCC is freely available in source form.
But of course, source code is useless to you if your computer has no compiler.
I was pretty sure that at least part of Holman's argument was that Apple could easily do all of us a favor and just ship with gcc pre-built. ("All of us" meaning the devs who do all this for a living as well as the casual coders who might want to install a Ruby library with C extensions.) How would that possibly hurt Apple?
Xcode 4 is still a pre-release, normally Xcode comes with the default OS X install disk. To make it available to non paying developers, it's been put on App store just one day ago. This is not a present problem, only a hypothetical future problem. That is another reason the argument is ridiculous. Apple do ship GCC pre-built, it's on the OS X install disk.
GCC is still the default compiler; Clang is still immature.
As far as I observed in my coworker Macbook gcc still is the default compiler in Xcode 4. Just compiled some software with it today, and it pops a lot of gcc's in ps aux.