> A-Eon has chosen an embedded PPC that is supposed to have at least 5 years of lifespan.

It's 10 years from product launch for the QorIQ P5 chips. This means availability from Freescale is guaranteed until June 2020 for the P5020 and until May 2022 for the P5040.

> I don't know if it is possible to find any x64 components and CPU that have more
> than a 1 or 2 year guaranteed lifespan

Yes, of course it is.