Years ago, a guy that I knew, who was good with STs at a kid's and HS level told me that the objective of a good ST coach is to coach kids up that have minimal roles on a football team, to make them feel as if they are important enough to gain playing time in the future. He said that you keep instilling in these kids the need to use it as a stepping stone, and that the other coaches will eventually recognize their dedication, and find ways to utilize them in other phases of the game.
If I was a marginal player on the Packer roster, I'd be working my tail off to be a productive member of special teams, so when they decide who goes, and stays, they keep my name on the list that stays. It's up to the coaches to instill that fire in them. Obviously, it isn't working.
I keep mentioning Cromwell for a reason. I can remember him running up to guys after a kick or punt return, or a punt, and giving them kudos for what they did. He was there with them, urging them on, to be better.
The last coach I saw on the Packer sideline that had that kind of fire in him was the late Kevin Greene, rest his soul. He played every down from the sidelines, with his personnel, and was constantly coaching those not in the game, as the game progressed. They were always fired up.