I don't mind having ads on my 360 Dashboard, mostly because I just ignore them. However, if I were in the middle of something and a Netflix ad popped up, I wouldn't be happy. I just find one thing about all of this really odd: Why should you have to yell something to bypass the ad? What if they don't have a microphone? It seems a little silly to do that.
Hopefully what Zet said will be true, but if they implement it, I wouldn't mind what Lightning said about having ads in demos.