My hope is Microsoft will use these emulation skills for security, too. I'd like to be able to instantly run an app of my choice in a secure virtual environment. Everything should be wiped out when I close the app by default, but I'd also want an option to keep the app's contents persistent.
I think they're kind of doing this already with Windows Defender App Guard [1] thing, which for one is a mouthful, second, it should have nothing to do with the exploitable Windows Defender code [2].
It should be part of Windows' lower-level systems, so that not much can interact with it, and it should be available for all apps, not just Microsoft's own apps. Windows on ARM, Project Centennial, App Guard, and more, prove that Microsoft has the ability to do that.
If they don't do it, it will only be for political reasons like not wanting Chrome users to benefit from the same technology, or wanting to sell it as "value-add" to enterprise customers, or whatever (basically the same BS they're pulling with Bitlocker).
[1] https://blogs.windows.com/msedgedev/2016/09/27/application-g...
[2] https://arstechnica.com/information-technology/2017/05/windo...