Actually IBM makes big iron machines using AMD processors as well as Power/PPC.
I have also programmed in MIPS assembly and it definitely is much better than Intel for intuitivity. Power/PPC a little less so but still good. I hope the x86 archetecture sits and rots. x86_64 (AMD64) is better but still not as good as the others.
It's a shame that
SGI dropped MIPS in favor of Itanium but at least there's still game systems for MIPS as well.