Or the NHL could just fire the incompetent refs and hire new blood.
The problem with that being that the reason that everyone thinks refs are terrible and inconsistent is because *gasp* people are biased. On every single call the refs make you have the fan base of the team that got the favorable call saying it was the right call, and the other fan base calling foul. You can fire them all you want, you can hire brand new people, you can train them day and night and it won't matter. Everybody will still have problems with the refs the second there's a call against their team. The refs are as fine as they've ever been, they make human mistakes just like they always have, there's just better technology to highlight it now. It's a part of the game and it goes for and against every team and in the long run evens out.