A preview of x64 emulation on Windows for ARM
I hope that the possibility of an industry-wide switch to ARM doesn't take away the flexibility we now have with the PC. Standardized parts and a well defined firmware interface (and thus "standard" bootloaders instead of a multitude like on ARM) is what makes the PC truly special. Moving to a world where you can't install Linux or where every single machine has incompatible firmware would be disastrous, IMHO. 
Current PCs can last for decades thanks to modern Windows and Linux being able to boot on old machines, without the need of special bootloaders or new firmware, just somewhat generic drivers (see AHCI, Intel HDA sound, etc)