There is virtually no hardware solution that cannot be found for a Macintosh. Competing against the Wintel juggernaut is a dubious standard for success. If Macs continue to be purchased and used by educators, creators, professionals, and ordinary consumers, Macintosh is a successful platform, regardless of Wintel quantities or price points. But Wintel machines are so universally used that it is really hard for a company like Apple to overtake them without making a major innovation. The choice of the Tom Peters quote is ironic and over-simplistic.
Brand loyalty fluctuates wildly between different markets.
Soda and cigarette loyalties are quite high, for instance, but kitchen cleanser and light bulb loyalties are probably quite low. There's no simple brand-loyalty paradigm that explains how well OS X will fare, least of all Tom Peters. To suggest that Apple is not innovating within the PowerPC chip design is absolute uninformed nonsense. The RISC-based PowerPC chips are already technically superior to the archaic CISC chips of the Wintel family in numerous ways, and the upcoming AltiVec processing functions of PowerPC G4's threaten to completely smoke MMX's wobbly inroads into vector processing. Read up on your casual assertions before spreading them like typhoid.