Earlier quoted context omitted.
A quite long one, unless Windows on ARM finally manages to be a success after so many reboots. Even if Windows eventually dies, replaced by something ARM friendly, we are decades away of anything else achieving the same desktop market coverage across the globe.
I wouldn't be so sure. Bear in mind that most Windows PC's are in offices and are therefore written down to $0 every three to five years or so, depending on how your accounting goes. Speaking of accounting, halving the power consumption starts to look like it might be a good idea if the computer has a service life of six to ten thousand hours. And Apple have proven that ARM based computers can be better that x86 ones…
Likewise I have given up on the Year of Desktop Linux when Windows 7 came to be, and even with the latest hiccups, I don't see a reason that it will ever change.
ChromeOS and Android, even if running the Linux kernel, aren't a GNU userland, nor a replacement for the Windows workloads that matter to the people that keep going for Windows all around the globe.
So unless Windows on ARM is a success (so far it has failed at it), Intel and AMD don't have much to worry about for desktop workloads.