If he actually had the tools to overcome the challenges he's facing now, I'd say, no, he can fix things.
But he is no different than he was in 2020 when he was figured out after having the best start of the season of his career.
He played his game last year and we were what, 2 and 4, worst in the league in drive duration and 3rd downs passing. That was him doing what he did best.
Even if he gets back to that level of play and could convince Hackett to call thr plays he loves, the guys STILL can read a defense to save his life.
Just as it was here, many of Hacketts plays work. Russ just wastes them, game in and game out.
Last year, you could go back to the JGraham days in 2017 on the All22 and see Russ making the same rookie mistakes he's making now.
Pete created the platform from which Russ could do his thing. He kept is competitive with a QB who could never read coverages or make line adjustments, couldn't see 1/3rd of the field or throw there, was only ever average on known passing downs and who became a 1 trick pony after he refused to be a threat to run the ball.
Unless Russ miraculously figures out how to play elite NFL qb - diagnosing defenses, and getting the ball out... something he's NEVER done, he's not coming back from borderline mediocrity.
