I'm pretty confident that both PS4 and the next Xbox will allow publishers to easily gate used disks. Currently, with EA's "Project $10," you receive a code to access multiplayer content and you buy that code for used games. PS4 and Xbox-next will not need you to type in a code for a new game since they will know the disk is new (And the code will probably be on some tag embedded in the disk).
This will make it easier for the users and while I am sure that some smaller publishers will use this feature to completely block used game sales, I suspect that EA and Activision will use this new seamless capability to blackmail Game Stop and other used game sellers into sharing the profits or at least not undercutting week 1 sales with used games. I like used games being available but I understand why EA would be angry with Game Stop convincing customers to buy a used game over a new game the first week of release.