NFC West running backs, take heed. It will be four more years of the All-Pro tandem of Patrick Willis and NaVorro Bowman killing your yards per carry.
Add to those stalwarts the deadly pass-rushing combination of Aldon Smith (NFL-leading 16.5 sacks) and Ahmad Brooks (5.5 sacks), and San Fran has a young, defensive core in place for years.
Sorry AFC North, your dominance of the smash-mouth defense concept is at an end. A few years ago the Steelers' LaMarr Woodley, James Harrison, Larry Foote and Lawrence Timmons would have closely beaten out Ray Lewis, Terrell Suggs, Bart Scott and others for Baltimore. But no more!