Pretty sure new games coming out will support both Xbox One and Scorpio. I would expect VR to be Scorpio only. The gap in the quality of experience is going to be really high between the two with VR. Why even bother supporting both with that in mind? For something that is pretty niche anyway. Especially when the Scorpio will most likely support Oculus and Vive instead of their own hardware.
I feel that's going to be a huge problem with PS4 and Neo also. PS4 owners preordering PSVR right now, with no plans to purchase a Neo or don't even know about it yet, are not going to be happy when they see the difference that's going to cost them potentially $500 more on top of the PSVR purchase to achieve. I wouldn't even support it if I was Sony, but guess you can't ignore that PS4 userbase?