I'm not in the "blow the entire team up; fire everybody" camp (is anybody? seems like a straw man to me...) but I will say that our being "division champs" this year has way more to do with Detroit completely imploding than the efforts of our team.
8-7-1, a NEGATIVE point differential, four straight losses to the niners, and a bottom of the league defense isn't anything to get complacent about. This organization needs a little shakeup. Nothing dramatic, but there should be some tweaks:
1. consider moving to a 4-3, 3-4 hybrid.
More flexibility on the defense is needed. Prime example is the way Perry was "developed" in his rookie year. Compare and contrast with how the niners converted Aldon Smith to OLB. His rookie year they brought him along slowly in the base D, and used him primarily as a pass rusher. The Packers on the other hand insisted on throwing everything all at once at Perry. Will anybody ever forget how clueless he looked his rookie year?
We also have a lot of twitchier DL like Worthy, Neal, Jones, Daniels, (even Raji), that would probably benefit from more "jet" calls, than "2 gap and wrestle with the OL and let the inimitable Brad Jones and AJ Hawk flow to the ball" calls.
2. Thompson: stop whiffing on defensive picks.
Not really a plan, more of a hope.
3. Sign some warm bodies at safety and possibly DL and ILB.
Any random, cheap free agent could help us.
4. Fire the strength and conditioning staff.
I don't believe that our continuing insane injury problems are 100% bad luck. Maybe 80% bad luck, but not 100%. Our players can't stay healthy, and they stay hurt too damn long. Is the S&C staff accountable for their performance like everybody else, or do they have tenure?
4. Continue to get more physical on offense.
McCarthy did a tremendous job this year setting the tone early with the running game and following through on his promise to run the ball. Not really a plan either, just an observation. Wanted to end on a positive note. This past season wasn't all bad.