Ummm...isn't this pretty much exactly the same thing that Wintel does? Incremental upgrades in between major processor-family upgrades? I think I'm missing something...
Oh, and I don't use a Mac, but I would have to think that having two processors in a computer (with a multi-threaded operating system) is actually a much more major performance boost than this guy so casually writes off.
The New PowerMacs: Cheaper, but Not Better