Hardcore fans will always upgrade to play a game. Hell id software games back in the 90s used to drive millions of hardware upgrades by itself.
No company deems hardcore fans to be a group that's big enough on their own. And if one suddenly decides to do that, it's indeed like asking for losing money.
If we suppose the Xbox One version will run at 720p at minimum settings, that'd put the PC GPU requirements in the HD 7790 range.
At this point of time, that'd just be a stupid move. If they have any intention to turn a profit on the PC version, it'd have to scale back to the HD 5000 series.
