Oh look, it turns out that every single media outlet was wrong, and my simple logic about how this would work is correct. I told everyone to chill the hell out and not jump to conclusions, and OH LOOK.
I don't think that's a fair assertion to make, considering Microsoft has been anything but clear on this issue. Xbox Support, Major Nelson, and even Phil Harrison have all stated contradictory things related to used games. No one's jumping to conclusions, Microsoft just isn't being clear. This is yet again unclear, as Polygon is citing their "sources." So really, who knows at this point.