It would have been "but Wimbush has so much more upside. He would have greatly improved. He is the only one capable of getting us to the promise land." No, sorry guys, Kelly handled this as well as he could have. He won 3 games and gave Wimbush a fair chance to live up to this "athletic potential" hoping he would play like a QB was meant to play, in addition to his athletic talent.
You might not like to admit this but he got a lot out of the weak armed, slow footed Tommy Rees. And, this is where I disagree once with oldirish, Golson improved a ton in 2012 and was doing well in 2014 until the rob job at Florida State, and the batted down passes that got picked off and returned against Arizona St or Arizona, whoever it was. He also played very well against LSU in the bowl game that year.
As far as blaming coaches goes, I have seen many including Dean Smith(hung in effigy), Jim Boeheim, our own Ara Parseghian(cannot win the big games), lambasted by fans only to become heroic and respected afterword.