Agree with the op. Its pretty evident that Bolin isn't going to win you games anyway... and for the past 2 games, you can partially blame him for the losses directly for his boneheaded interceptions which basically undermine the point of starting a 5th year transfer instead of inexperienced younger players like Gio and Jonathan.
As far as Bolin "losing confidence" that'd be on him, and he'd be most respected if he took the benching well by mentoring Lewis or Gio to be better. Its pretty obvious that he's not going to be an NFL QB anyway, so do what is best for the team. He hasn't performed up to par and was piss poor against a mediocre opponent in EMU after throwing a killer INT against Washington when the defense was beating up on Browning which gave Washington their momentum to put the game out of reach.