What do you think is easier? Fielding a top 5 defense or finding a franchise QB along the lines of Brady, Manning (not now, back when he actually had an arm), Rodgers, Favre, Young, etc?
Last night was another in a long line of examples in that defense indeed wins championships. IMO, I think it's a much more realistic task to field a top defense then find a HOFer QB who you can ride to the SB. From 2011-2014, GB has relied on Rodgers to play essentially out of his mind. Those defenses had some flashes of playing decently, but whether it was a glaring hole at ILB or FS, not enough pass rush, or breakdowns in the DB, the Packers D simply weren't good enough.
In Favre's prime, after 1998 it was the same issue. Usually a top 5-10 offense, but a defense that came up short again and again.
From the 2nd half of 2014 through last season the defense has improved. The question is how much can they improve in 2016? Myself included, I know we've talked about addressing the TE position and shoring up the OL. But when it comes right down to it, the defense is where it's at. And where it probably always will be.