I don't think Therrien is a great coach by any means, but he shouldn't be scapegoated for this mess. They have vastly improved their underlying numbers and have essentially been an elite 5x5 team all year. 5th CF% this year, last year they were 23rd. They've improved and with very little personal movement.
It's not Therrien's fault Bergevin ignored the backup goalie position. Save percentages for guys not named Price- Condon, .908, Scrivens .882, Tokarski .878. There's your problem. Those 3 have played 39 games for the Habs. League average save percentage is like .915 and they're running these guys out there night after night.
That said, win tonight and make them fire his ass.