The reason that most people are so anxious for G5 PowerBooks is that they know that it's only a matter of time before Apple releases a G5 in a laptop form-factor, and they don't want to go out and buy a really high-end G4 PowerBook that, in two or three months time is completely out of date. I have a G3 PowerBook. It is the weakest system in my house in OS X - there'll be an OS revision in the not TOO distant future (I'm thinking 10.7) that will be fully 64-bit, in which case the G4 PowerBooks will again be useless.
It's perfectly understandable to want for a G5 PowerBook; they're supposed to be Powerful machines. Now they're just iBooks with shorter battery life, better screens and slightly faster clock-speed.