Players should get the best offer for their services that they can, they don't have to give up millions of dollars and be loyal to the Packers when the Packers might just as well release them in a couple years, but there are some non-monetary factors that goes into their decision. RT Bryan Bulaga received an offer for more money from the Bills but decided to remain with the Packers. I don't know which teams might have been talking to WR Randall Cobb's agent last week, but Cobb got paid significantly less the Chiefs paid to WR Jeremy Maclin ($22.5 million guaranteed for Maclin, $17 million for Cobb).
The Vikings have released WR Greg Jennings. 2 seasons in MIN 2013: 68 rec, 804 yds, 4 TD 2014: 59 rec, 742 yds, 6 TD pic.twitter.com/vU6YtRooShWould WR Greg Jennings have been released now if he had re-signed with the Packers in 2013? I really have no idea, but it's a fair question. His stats were good over two seasons with multiple below average QBs, and he might have reached 1000 yards in each of the last two seasons with QB Aaron Rodgers (Jennings has only missed one game over the past two seasons in Minnesota). If he had stayed, then he would have presented the Packers with a decision between to make between him and Cobb.
— NFL on ESPN (@ESPNNFL) March 14, 2015
As for the current situation, I can't see Jennings returning to the Packers. He was still useful last season, but he wasn't worth the cap charge (the Vikings are still taking a $6 million cap hit in 2015 for his release). He wouldn't start with the Packers, but he could start somewhere else. He won't receive a huge contract, maybe a Brian Hartline like two-years, $6 million contract, but he should be able to find a starting role somewhere.