x86 would be dead if ARM ISA offered like at least 20% perf boost or energy savings. But since ISA doesn't imply perf. characteristics itself, then x86 will be

x86 would be dead if ARM ISA offered like at least 20% perf boost or energy savings. But since ISA doesn't imply perf. characteristics itself, then x86 will be alive. The hard part in changing hardware's stuff is getting software to adjust.