I agree with Wain.
Even Intel know that the x86 is soon dead.
I would prefer a platform that is using a modern RISC CPU(the PPC is only 10 years old).
You will either upgrade your computer platform now, or wait 5-10 years when Intel and AMD say "Nope! That's enough! We're going on with another architecture.
If you're worrying about these machines not using the old x86 hardware then you're not thinking about the long term future enough.