Wouldn't it be great for me the advertiser, YES. Would it be great for the consumer, no.
It's stupid and the fact people are already condoning Microsoft to stuff ads in your face where by you're paying for a service is sad enough. It's no wonder they're conjuring up these ideas, you the consumer has already said it's okay. Cancel your live service, throw the xbox in the trash bin and start a world wide boycott, the tools have never been easier to make it happen.