Former IBM'er here. Power Systems are not as ubiquitous as you think. Their biggest customers are insurance/banking companies, but that consumer base has been gradually shrinking with organizations migrating to more affordable commodity clouds (Amazon, etc.) and services.

The Power Division within STG has been declining in revenue for at least 6 straight quarters, and employees within that division are first on the list whenever IBM wants to perform a layoff.

IBM no longer has anything to do with embedded PowerPC. That is all Freescale. The lines diverged sometime back in 2005 or 2006. The POWER5, POWER6, and POWER7 are quite a bit different from the PowerPC.

POWER are used in cars, iirc? I also was looking at a neat little POWER chip the other day to play with. Cool architecture.