[citation][nom]memadmax[/nom]x86 built the world, why would they throw it away?[/citation]
So did mud bricks, back in early civilization, but you don't see too many people using it today. Wood and concrete work so much better.
ARM is efficient. that's the big advantage. Sure, it probably wouldn't do too well at high performance PCs, but I'd love to have several ARM based domain controllers around, (that would cut our power costs considerably) and they'd work well for internet surfing machines.