The question I have, where do you go from here since there is no follow up chip to the PA6T, so you've got to choose altogether a new chip (even if its ppc based). There is not another ppc chip even in the pipeline for the power/watt combo that PA6T has, so immediately you have painted yourself into a corner regarding a follow up.
The answer is very clear. A 1.6 TeraHz Multicore CPU with x86 & PPC embedded cores.
