Mueller recognized long ago that there was no collusion and nothing illegal about what Trump did. His dilemma is how to get out looking like a success without getting a meaningful scalp. He has also recognized that his investigation only helps Trump by keeping the Democrats hopelessly mired relitigating 2016 and unable to articulate a coherent policy agenda for the future. Russia and collusion is now regarded by everyone but ardent Democrats as a loony conspiracy theory. Mueller could come up with a Dear Donald letter signed by Putin and two thirds of the country would dismiss it out of hand. The public has a short attention span. Interest in the Mueller show peaked a year ago. People want it cancelled. Perhaps after the midterms Rosenstein will be told to have Mueller wrap it up. Mueller will try to get a few more process crime or corruption indictments and call it a day. His big worry: how to let the Democrats down easy.