Current Windows on ARM seems promising with its x86 emulation so far, but still has a lot of room for improvement. Combined with the Windows 10 S sandboxing old windows apps I can see Microsoft catching up again in a few years once we have more widely available high power ARM processors.

In IT though, I don't expect any changes over to ARM hardware for another decade. I know where I work we have plenty of legacy cruft which would probably run into some weird edge cases if emulated on ARM.