If any MS CEO or person in charge ever actually reactivates the initially planned DRM system after the XBO has established itself and broadened the install base they should give back their business diploma.
It would be the equal to putting a gun to your head and pulling the trigger. No one would ever believe them anything again and they'd destroy customer trust for a very long time, maybe for all time. Hell, their disastrous E3 appearance nearly sunk the ship before it even had a chance to be played by the consumer.
These are big issues and since Sony so masterfully pissed on their shoes they are cornered.. they had to abandon their plans or risk falling back from day one when both consoles are released.
So their DRM version is gone for good.. the market has spoken and MS was forced to blink. They may try some other stuff but they'll be extremely cautious not to get put into the negative spotlight again.