I'll preface that I'm not saying these things should or will translate to us being better - but it's a solid theory IMO.
Mario was a problem and at one of the most important positions on the field he offered next to nothing. Not only would his poor effort/play effect his personal responsibilities but because he didn't command his normal portion of additional attention from the offense - that side of the defense and the entire defense will be better off.
Our core of great players are young - as they continue their development they should get better year by year (Dareus, Watkins, Gilmore, Darby, Glenn - Miller and Karlos honorable mention)
Whaley is excellent at drafting. I like the little FA signings that he made. I.E. Hankerson could help and so could Zach Brown
Rex has been a good defensive coach - he should get more out of this defense. Most of what was leaked to fans was communication issues - in year 2 with most of the same players this should improve. Like it or not Rob should help with communication. Ed Reed should help our weakness at safety learn in the film room.
Roman is a good offensive coach - year two is always reasonable to think things run smoother.
The off season should help Carpenter heal and come back to his normal accuracy. More points is always a good thing.