Stuff like this hurt relations amongst business partners. Acti spent weeks and months working out an exclusive ad deal with PlayStation only to have Xbox come along and ridicule it. Doing stuff like that hurt relations. No one at Activision is looking at this and saying "how funny, how clever."
You have to respect contractural obligations if you want to remain in good standing with other business you relay on to deliver content.
The game is not even out yet and MS is already, selfishly, dragging the IP name through the console war mud, an image Bungie and Activision have been trying to avoid since the game was announced. The folks that work out these deal are business professional, they are not fan boys or kids on the net, they care not about the console warz, it's not appropriate to ridicule their work.
And this is from a pub that took good care of Xbox last gen, to Acti it might be a slap to the face.
