I'm still not sure where all of this is going to go, but it has to take a sharp turn for the worse before long. Saul was totally amoral under all of the clowning, but Jimmy is just a but shady and has an idea of right and wrong. So, my guess is someone close to him has to get 'offed' and he takes up with organised crime to try and even the score. My guess is that girl/friend of his catches a bullet or something, probably connected with the Tuco crew. Either that or the brother has something happen to him. Either way, something has to change by the end of the season to jolt him towards the dark side.