Note that 12UP, whoever that is, cites a note in rotoworld which in turn cites Demovsky. A good example of the echo chamber. Why not look at the original source?
http://www.espn.com/nfl/story/_/page/32for32x171118/predicting-biggest-offseason-change-all-32-teams
"
Sam Shields, the Packers' former No. 1 cornerback, will be done in Green Bay. The Packers will release Shields, who hasn't played since Week 1 because of a concussion that landed him on injured reserve. It was his second concussion in nine months and the fourth known concussion of his NFL career, which began in 2010. He has one year left on the four-year, $39 million deal he signed in 2014, and the Packers would save $9 million on next year's salary cap if they let him go. The move might force them to draft another cornerback high, even as high as the first round."
Domovsky states it as fact without citation, not even unnamed sources. He's a good reporter, so I'd assume he has some basis. Or is this a studied conjucture given the detailed rationale?
While missing an entire season with a concussion does not bode well, if he wants to play and he's cleared to play, then he'll play somewhere at a price in line with the risk. Perhaps not with the Packers, or not with the Packers at this salary. There are plenty of guys in this league playing on 4+ concussions, officially reported or not. They want to play regardless of the risks. I think Cam Newton had 2, maybe 3, in the opening weeks of this season without ever leaving the field.
Frankly, there's little point in conjecture until his release actually happens. If it's going to happen, it will be before the free agency period begins. That will be the time to consider options. Until then, we won't know who's available on the free market. Judging from the 50 posts above, I fully recognize I'm alone in this perspective.