Keep in mind that this defense's problem is not only the secondary, it's just one of the problems.
The major problem IMO is the pass rush. Our defensive line / linebackers are just not able to make it to the opposing quarterback or to put enough pressure so they can force throws or make mistakes.
The year we won the SB look at our d-line: Ryan Pickett - Cullen Jenkins - C.J. Wilson - Howard Green - B.J. Raji - Jarius Wynn
We finished #2 in the season. I remember opposing offensive lines had to double team Jenkins, which opened up the game for Matthews. On the other hand they double teamed Matthews they had B.J. Raji coming in from the middle of the line.
Defensive line (This year vs SB year)
2010: Jenkins 7 sacks - Raji 6.5 sacks - Wynn 1.5 sack - Green 1 sack Picket 1 sack = 17 sacks only from the d-line.
2016: Daniels 4 sacks - Jones 1 sack - Lowry 2 sacks - Eliott 1 sack = 8 sacks
Fair to say that the defensive line was no where to be found this year to help the passing defense.
Linebackers (This year vs SB year)
2010: CM3 13.5 sacks - Zombo 4 sacks - Bishop 3 sacks - Walden 2 sacks - A.J. Hawk 0.5 sack - Chillar 1 sack - Neal 2 sacks - Poppinga 1 sack = 27 sacks
2016: Julius Peppers 7.5 sacks - Nick Perry 11 sacks - Clay Matthews 5 sacks - Farrell - 2 sacks = 25.5 sacks
As you can tell the linebackers are quite close compared to 2010 season but the defensive line as you can see applied no pressure on the opposing QB's which everyone knows what happens. Opposing QB's tend to rip apart your defensive secondary. Sure the run defense was good this year but let's face it, it's a pass first driven league and when your defense can't stop 3rd downs and long you've got a problem.
The secondary needs to be fixed as well but I don't think it's a big fix. If we can re-sign Hyde, draft some talent or sign a free agent & if Randall or Rollins wake up we should be fine but if there's no pressure from our defensive line to push that line, no matter who the CB is on the opposing side the QB is going to find someone open.
Regardless of all this I still think Capers should be gone! I think this teams defensive players aren't being used to their strengths. I keep saying it over and over, the scheme is broken specially when it comes to the pass game. The middle of the field is way open. Imagine you've got Gunter & Burnett covering Julio Jones and you see that his still killing you maybe it's time to use one of those players to blitz or something or be creative.
Capers isn't what he use to be, the NFL evolved, the QB's got more elite and Caper scheme unfortunately will not get us a SB.
Glad To Be A Packers Fan.