from Stu Hackel at The Hockey News,

When the league’s GM’s meet on Tuesday, the Coach’s Challenge is supposedly an agenda item again, as it has been periodically since Florida GM Dale Tallon proposed it 2010.

But predicting what might happen is a fool’s errand. In the winter of 2013, it seemed the managers favored implementing a challenge but nothing came of it. Six months later, the GMs actually approved expanding video review to be sure all four-minute high sticking penalties were correctly called. Mysteriously, NHL Hockey Ops never implemented it.

Once upon a time, the NHL’s video remedies to get the call right was the sports industry standard. Now,they’ve fallen behind, the league having resisted any expansion, including the Coach’s Challenge. After last March’s manager’s meeting, Coyotes GM Don Maloney summarized a few of the reasons why. “We all have sat there through goals being reviewed and how long it takes,” Maloney said. “We’re really concerned about taking the game away from the on-ice officials and taking it up to big brother and having the game regulated from above, and nobody wants that, including big brother.”

more with numerous video examples of why there should be a coach's challenge...