Hockey players are Humans. Humans don't control their motivations, they don't control the needs of their families, and they don't control their declining physical capacity. I find your take on this a product of unreasonable expectations combined with uninformed negative assumptions - basically you are looking for an excuse to trash players you don't like. Its not as if these players can choose what trade offers come in for them.
Kronwall has won a cup, has a family, wants to be a career wing, has broken every part of himself and 18 months ago looked like he was finished - its remarkable he's been able to be as good for us this season. He's also our most vocal leader, and is universally respected. He gets to call the shots, and he wants to stay.
Ericsson is another whose commitment shouldn't be questioned. He's almost as much of a walking surgery manual as Kronwall. He'd probably be more open to a trade, but who's going to trade for him with that contract.
Helm? Guy can't crash and bang as much as he used to, but its only his salary that disappoints. He's still a good skater, a responsible PK guy, and someone who plays pretty will with everyone despite his obvious limitations. And another who has a seriously long injury history that he keeps coming back from and playing well. Another who's contract will be hard to trade.
Howard? He wants to stay here, we clearly got no decent offers...and for a goalie, who wants to be back up, which is what Howard would be on a contender, particularly joining so late in the season. If there had been as many goalie injuries around the league after Xmas as in some previous years, he would have been traded. Also, his groin has largely held up this year, which suggest some work on his part.
Abby? - You may have a point on this one re work ethic on ice. But we all knew it was bad contract at the time, and so its proved. I hoped his play would hold up for another year or two, but as the league has got quicker his legs have started to go, and bar a decent shot, he was never a skill guy.