Once again, he's been in the league for a decade. There isn't anything that Carr is going to do over the next 4 years that he hasn't done in the last 10. There isn't a sudden epiphany that Carr is going to have at 35 years old and at this point in his career.
And I don't say that thinking that he's a terrible QB. He's not. He's just very limited and his limitations aren't a great pair with the other players that we currently have.