If not retained by the Packers on a cheap deal, maybe 2 years, he will be a street free agent and a camp arm for someone.

His absolute top upside would be to find a new coach, make some progress with some emergency starts and get a 3rd string job like Case Keenum.

McCarthy knows much more about QBs than I do, so maybe he is being serious about signs of development. But I am very doubtful. Of all the things you could list as the problem, inaccuracy is the big one, especially deep. If its mechanical or footwork related, what does another year get you that 3 did not?