I'm from Montreal & here's my opinion on it.
A coach that wants to coach the Montreal Canadiens should not be hired for his language but for his knowledge and what he will bring to the team. All tho, I do think that the coach should take french courses and address to the french media in french. As you guys know, Quebec is a french state and not an English one, therefore our first language here in Montreal is french. It would be like bringing a russian / swedish / chinese coach that doesn't speak english coming and coaching a U.S. team. I'm sure you would want him to go and learn English to address to the media in English wouldn't you?
...that's what I say! Learn f&cking English if you are gonna work and live here!