Perhaps Paralels could bundle Win 10 for ARM, any chance they culd make a deal?
Considering Microsoft does not license Windows on ARM to non-PC hardware OEMs, I would say the chances are unlikely.
Also, Parallels and VMWare would need to completely re-write their applications to support Windows on ARM and the market might not be large enough for it.
Personally, I would not be surprised if major users of x86 Windows virtualization (so Enterprise-level users) on Macs just RDP to Intel servers running Windows VMs. All the hard work is done on the VM, not the local host, and networking is fast enough. It's how I do my "heavy lifting" Windows work that is more than my iMac's Windows VM can comfortably handle.