First of all, just cause a box has intel hardware in it doesn't make it a 'POS'.
Furthermore, as has already been pointed out, and what Apple got a long time ago, is that it's all about the software.
I think the Centrino idea someone struck is a possibility, P4's are not really currently where it's at architecture wise. Also, if Apple did that then people might actually have a clue what hardware is in the pipeline, which is not how Apple operate (witness the frenzied predictive posts on forums like this).
Um, yeah, that's all i can think of