Game theory (and possibly anti-collusion laws) dictates that the best course of action for any one website in a sector is to keep their website up. If I'm Bing,

Game theory (and possibly anti-collusion laws) dictates that the best course of action for any one website in a sector is to keep their website up. If I'm Bing, and Google, DDG, Blekko, etc. shut down, that's exactly the time that I want to be up and running. So even though this is a good idea, I don't think it will happen. At least not all at once like this.