Oh no I do understand. If publishers want to devalue physicals disks, or what I rather prefer as pros and cons of physical vs digital content ownership, then library sharing is a hell of an incentive. But rather than use that incentive there is now nothing? How is that better than same digital sales and some saved/lost used game sales?
Sorry, as a logical argument, it doesn't stand up.
There is already incentive to digital (discless, permanent license).
License sharing = losing extra revenue on digital on top of losing revenue on used physical.
No way, come hell high water, would publishers agree to that in an age of rising game costs and risks.