I think the biggest mistake of Microsoft and the Xbox One, was to focus attention on disc based DRM instead of just focusing on the transition to full digital media. Its like getting into a war when the war is all but won. Sure, used game trading will have an impact for the next few years but all that time, a large percent of gamers, at least the adults who actually pay for the games, could transition to a Steam-like full digital distribution model. Instead of getting into the physical media used game war, they should have gone the Sony route and just left it up to the publishers. Why be the bad guy if its not even your job to do so? Instead, creating a great infrastructure for digital games would have been much more productive. For example they could have presented how much better things will be in this "future" model for both gamers and publishers by providing a digital distribution network that would support amazing features:

• Fastest way to get games without trucking to the story and putting it in boxes (go green!)
• Allow publishers s to have sales and specials over time (aka Stream) and create revenue where none existed.
• Create ways to both "turn in" digital licenses for a discount on your next digital purchase (support used games!)
• Create ways to "transfer license" to a friend for a discounted "re-activate" price (support game trades!)
• Support an independent digital store and allow "digital self publish" (support indies!)
• Plan to provide an "Xbox Classic" service to play 360/Xbox Original games. this could be done with cloud gaming like "On Live" and you could even provide a discount to classic game access if the user had the original disc (future proof compatibility)

All of these things and much, much more could have been done by MS to move to a new age of digital publishing. Instead, all they did was present the negative side of things and explain how they would kill the current one. And all its doing is getting people upset and letting Sony play the innocent and get all the good press. Way to miss a great opportunity :)