My ultimate problem with Therrien is that I just don't believe he's a good coach and we won't take that next step with him. It takes beating a superior team in the playoffs to prove to me he's a capable coach, TB should be a fun series, but I think if he can coach us past a team like Boston(The only real contender in the East) I'd be happy with keeping him around another season.
I'm only in a rush to see him fired because the top candidate to coach the team next is available(Guy Boucher), and I don't think he'll stay off the market too long.