IMO the OL is most responsible for the number of sacks but it's not alone in responsibility; the scheme and Rodgers also share in that responsibility. In 2011, the Packers were incredibly successful with the deep ball and Ds adjusted to that by going more to 2 deep safety schemes. In doing so, they were not only "daring" the Packers to run but also to throw the ball in front of the safeties and play a more ball control style of offense. McCarthy's philosophy seemed to continue to emphasize the vertical game too much and that was a factor in Rodgers hanging onto the ball too long at times. So for me the order of blame for the number of sacks Rodgers takes is 1) OL; 2) scheme; and 3) Rodgers.
What I'm hoping for this season is not only a better performance from the OL, but also a scheme that takes better advantage of the D. Not only with a better run threat but also taking advantage of the underneath routes the Ds at times are "giving" them. And I think there's reason for Packers fans to have realistic expectations both of those things will happen. The Packers should have their best LT starting since Clifton left (admittedly not a high bar) and the only question mark on the starting OL is RT, which at least is easier to find than LT. I don't think it's a matter of just "rearranging chairs". Another OT will have a much greater chance of replacing Newhouse at RT than he would if Newhouse were going into OTAs and camp as the starter at LT. I expect the OL to be both a better run blocking and pass blocking one and I don't think that's unrealistic. And Wilde has reported that McCarthy will modify his scheme along these lines. That makes sense with better RBs to hand the ball off to and considering the number of sacks Rodgers has taken, Finally I would like to see Rodgers throw the ball away more often. I believe one of the stat sites determined Rodgers was responsible for 10 sacks last season. I'm not certain that was the number and it's a subjective determination anyway. No matter the exact number, I think we all agree he does hold onto the ball too long at times. Yes, a sack is better than an INT, but when time "is up" an incompletion thrown out of bounds, 10 feet over the tallest WR's (or DB's) outstretched hands is better still.