I would completely support Bungie if they just put their hands up and said "Look, we -blam!-ed up. So here's a massive update which improves every story mission and adds in tons of story elements that should have been there in the first place." I would gladly go back and replay the entire game all over again and I bet it would feel like I had just gotten a new game too. Sometimes you just need to admit you -blam!-ed up and fix the mistake and move on. People appreciate that.