John C. Dvorak is a legend in the computer community, especially the Mac community. He's been more wrong more consistently on more subjects than any human being since Aristotle; so throughout the years, his predictions have been wrong so often that I would not trust him to predict that the sun will come up tomorrow.
Apple is considering a switch to 64-bit processors--but to the PowerPC 970, not the Itanium.
If Apple were to adopt an Intel processor, it'd be the end of Apple. No existing program--not one single one--would run on an Intel processor, and I guarantee that no commercial software vendor would be willing to support *three* platforms (Windows x86, OS X PPC, and OS X Itanium.)