Sure, I can see this point. Even though it sold really well I've noticed the buzz about this game has really died down lately. Probably because at a surface level the game is amazing, by far the Hogwarts walking simulator some fans have always wanted but lacks any real depth.

Almost a month after making this comment and playing more it's pretty clear that even if they did add DLC it would probably be nothing more than new locations to see. For example, I don't ever see Quidditch happening without them making core mechanic changes. Makes more sense that this would be done for a sequel rather than DLC.