I think I've said this places in the past. But that would be suicidal for them or any other company if they're the only ones doing it. By cutting off used games, they will in effect not only bring about hackers that will try to circumvent it, but they'll annoy their partners that dabble in used games as well. Gamestop for example may just drop selling xbox products all together if they nullify used game sales.
So the ONLY way this works is if all three major hardware players do this. All three companies doing this would force places like Gamestop to conform. Because doing this alone is almost a death wish.