Huge. And his absence next season will be huge. From the stand point of on-the-field performance, this is a disastrous move. They can't sign Richard Sherman to replace him (and Revis isn't that player anymore) and basically anyone else is a step down.Packers released CB Sam Shields today. He has been one of the top cornerbacks in the NFL since joining the league. pic.twitter.com/KufNqrOUDE— Nathan Jahnke (@PFF_NateJahnke) February 8, 2017
But this roster move isn't about his football play, it's about the five documented concussions he's had during his career (along with who knows how many undocumented ones). This is like past ones with TE Jermichael Finley (never re-signed after a spinal injury) and FS Nick Collins (released after a spinal injury) and it hurts just as much as those roster moves. All three of them are great players, in the primes of their careers, and they were cut short due to serious injuries.
The defense has to sort out it's situation at outside LB with three players (Peppers, Perry, Jones) headed to free injury, but having an upgrade at cornerback (not from Shields, but from his replacements last season) is the more important task. There's always the draft but they tried that in 2015 and ended up with Randall and Rollins. Just like with Shields back in 2010, they did better job that year finding an undrafted corner (Gunter). With the salary cap room saved by releasing Shields, it would be best spent targeting a free agent corner who would fit in Capers's system.