Probably not
It's not like he's a 19 year old with huge upside, he's 26 with a full year on the smaller ice. He looked good at times last year but he also was directly responsible for a lot of goals on plays where a good defensive defenceman would not have been beaten. I hope he's just crap on his offside and Therien, or Therien's replacement, knows enough to play him on the side he can play.
At times last year I thought all the habs were missing was a healthy Markov. If he can play 30 solid minutes a night again (or even 25 pretty solid ones) and Subban does about the same there are not that many minutes left over for the other pairings and lots of opportunities for those guys to look good. We 'll see.
If he looks OK but not great pair him with Markov, pad his stats, and deal him at the deadline. If he becomes a number one the team will be good.