But that's patently untrue.No matter how I slice it in my head, I don't think the world is actually ready for this. There's so much that could go wrong with this, for the industry, for the user,... While a physical good is finite and obviously only exists as is, a digital good you can make copies of so the only solution to combat people just buying, making a copy of, and then selling the original is stricter and much harsher DRM and tracking where games go, etc. And it basically would push GaaS and games-as-a-service stuff a lot harder than it's being pushed already.
The only way I think this might be feasible in the present day is if you sold entire accounts rather than individual pieces of your library.
On consoles the console itself is DRM. You can't make copies of the disc that work on the console and you can't make digital copies that work either. The license is tied to a user and thus, can be untied and transferred. The current protections against piracy will be unaffected by a user being able to sell their entitlement digitally.
On PC the disc is irrelevant and you can't resell pc games to begin with. So DRM wouldn't be affected because it's already there and frankly, some people who would circumvent DRM for piracy may actually be given a reason to buy games on PC if they can get their money back legitimately.