I think what Sony should do, or Xbox or Nintendo for that matter, is split the cost associated with owning a disc and playing the game on your account.
In my ideal world, this is how game distribution would work.
I buy a brand new disc for $60. It also comes with a Digital Code. I key it in. I have now associated that disc and game to my account. The code is a one time use to link the disc to my account, not a digital download code. I need the disc to play.
When I am done, Isell the disc to a Video Game Shop. They buy it from me at $15. They now sell it to another buyer at $20 without any code. It's just a disc with the content. The new buyer has only paid $20 to own the physical copy. Maybe he's a collector.
If he decides to play the disc, he needs to now buy a digital code to associate the disc with HIS account. So he pays Sony $20 to be able to play the game, with a disc on the platform.
Sony has now made $80 from 2 players. The store has made $5. I paid $45 in the end. Instead of $60. The other guy has paid $40 but also now has a physical copy to show for it. Anyone with the physical copy can play the game, but they each need to purchase a Accessibility Code to associate their account with a disc, cheaper than a full digital copy, or maybe more expensive?
Obviously my analogy is very crude and my maths isn't mathing. But from a concept point of view I just thought it'd be great if Game Publishers and Console platform holders can learn to separate, and keep alive, the physical medium, from the accessibility to interact with that content in that medium.