Humans are wired to see a physical item (disks, etc.) and think *mine.*
Well, yes, but you oversimplify. There is a long-established doctrine of first-sale in the US, and it's not just part of case law, it's part of the culture. The non-resaleability of Kindle books or anything else digital is still new to the popular mind, and carries with it a certain implicit devaluation.Even though most people at least abstractly understand the non-resaleability of bits (whether due to the infinite duplicability of DRM-free media, or the practical inflexibility of DRM systems), a big reason they don't complain about iPhone apps or Steam games is likely the frequently low prices they pay.
A $60 game demands at least a bit of fungibility for most consumers. A $0.99 one doesn't, regardless of whether it came from a disc or an app store. If, as the supposed insider claims, XBO games can actually retail for half what a resale-friendly game would, then that offsets the implicit devaluation of non-resaleable media.
If Call of Duty 8 retails for $59.99 on the PS4 and $29.99 on the XBO, that suddenly makes the DRM a very appealing tradeoff. If they're both $59.99, Xbox is dead in the water.