I actually think Trump may have decided getting impeached and pardoned is the best way to get off, way back when he first said: "Oh oh, I'm f*cked." When he heard about the FBI looking into him. It would explain some of his crazier acts. He seems to be doing stuff just to piss people off at him, that is completely off the rails.
Of course, a President Pence pardon does not help get him off any state charges from New York. I would add Florida but I doubt they would ever charge him with anything.