What's going to happen is MS is going to do an exclusive with a big brand who doesn't require Google. At that point Bing can say, exclusively on Bing. Money will make people do anything. I'm sure a few newspaper type sites might be willing participants in that. I don't see why websites will be any different and in fact you see Facebook using Bing. The next level of that is simply having a brand site blocking Google bot and deindexing completely. I see that day coming.