People expecting a dramatic change in Cutler are probably going to be disappointed. You usually are who you are as a quarterback your third or fourth year as a starter, and he's now in his 5th. He's going to be a high risk high reward type for the rest of his career.
What can be changed is the offense he works in. If the Bears weren't division winnings the cries for Martz to be fired would be deafening. His offense has been terrible. 30th ranked in total offense as of today. That means he's a few steps behind what Ron Turner was doing. Put Cutler with a competent OC and perhaps you'd see a marked improvement in the # of mistakes made. As for Cutler, he is what he is and that's what he will be.