I say that based on Apples decision... if they chose Intel then there must be something wrong with PPC... otherwise they wouldn't have changed their entire processor lineup...
Steve Jobs: "Intel processors provide more performance per watt than PowerPC."
My G4 (Digital Audio) tower was debuted at MacWorld 2001. I ordered it from the Apple Store the day after it debuted. I'm running 10.4.11 and the computer still works fine on its 8th birthday. (I am glad I skipped the liquid cooled G5 towers. My understanding is there has been a good bit of trouble with some of those).