Hopefully some of this comes to Windows guests. One of the major issues right now is that Windows virtualisation isn’t great. VirtualBox has GPU problems, VMware requires a lot of messing about with kernel modules if you don’t use Ubuntu, if KVM/QEMU is able to make a smooth environment for Windows guests that’d help bring people in who still need Windows for the odd bit of software or two.
I remember there was a GPU driver for Windows but that seems to have stalled?
Edit: Cleared up why I think VMware is a bit of a mess.