NHL coaches don't have a very impressive lifespan. Normally, a coach will last between two and three seasons with a team before being cut lose and moving on. Changing coaches can be an excellent way for a team to change the tone of their season and get things turned around before disaster strikes.
That being said, coaches aren't normally fired midseason, save for a coach or two per season. So, when I say that these coaches will not survive the season, I mean that they will either be fired during the season or after the season.
The following coaches are on a short leash heading into the 2011-2012 NHL season.