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It definitely depends on where in Canada you'll be living. Born and raised in Alberta, the last time I spoke French was learning it in elementary school.

I know more spanish, mandarin and tagalog phrases than I do french!
 
My brother-in-law's grandparents speak French fluently, but can't speak English. They came to visit him in Saskatoon, and expected no problems, because after all Canada is a bilingual country. For the first few days, they would talk to people in French in stores, the hotel, wherever, but they finally gave up, because they never met one person who could understand them or reply.
Canada isn't really bilingual, in the sense that most Canadians can speak both French and English. Instead, in most of the country people speak English - and minimal or no French - and in Quebec and a few parts of Ontario and New Brunswick they speak French. The Francophones are more likely to also know English, but even then outside Montreal and Ottawa a lot of them are French-speaking only.
 
Or my future in-laws ( who can speak french but are first language English) have had people refuse to help them in stores, unless they spoke French. And also, I heard on the news of a woman at a metro station that requested English service but the attendant refused, then reportedly got physically violent when the woman reported her. The division between the anglophone and the francophone population ( at least in Quebec) I feel is unhealthy for both Quebec and Canada's economy .
This is just my opinion as a future immigrant. It discourages me from wanting to move here as the job market seems limited unless I speak fluent French. (Which I don't . And that also makes it hard to live near my parents in the states.). This is just my opinion mind you. I don't mind learning French but I'd have to live in another province until I learn it. Thankfully, I have had three years previously, but some people haven't.