Note to Macbeth, Act 5, Scene 5, line 49.
"[I] wish the estate o' the world were now undone"
The "estate o' the world" is the way things are and have always been. Up until this moment, Macbeth had thought that he would be an exception to the rules of the "estate of the world" because he had been promised by the witches' prophesy that he need fear nothing until Birnam wood started to walk towards Dunsinane. Now that Birnam wood is on the move, it looks like the rules of the "estate o' the world" are likely to catch up with him and make him pay for his crimes.