A Question about the Future of Xbone Backwards Compatibility and Windows 10 Crossplay

I’ve been curious
With the backwards compatability thing, it allows you to bring 360 games you own into your xbone library
and Windows 10 has an xbox app that mirrors the xbox one and connects with your account and dvr stuff and will eventually have cross platform play
and you can add regular PC games to your “xbox library” the same way you can add non steam games to your steam library
so I’m wondering if, when backwards compatibility and cross platform become a thing for the xbone, can I play 360 era pc games on my xbone if they’re in my windows ten xbox library in lieu of getting a bigger pc?