It seems to be political pandering to Quebec (seeing as the Liberal party is losing seats in their precious Toronto base). In reality, I don't believe there are that many French speaking Canadians outside of Quebec to warrant such action.
This also limits qualified individuals from applying to work for the police or the RCMP, because their language skills would take precedence over any other important skills they might have. This would, in my opinion, weaken the police and the RCMP.
I also can't see voters west of Ontario liking this policy either. It smells too much of Trudeau.