You are presumably referring to the OQLF (a provincial institution, not a “Canadian” one) which enforces French as the dominant public language in Quebec. Given that Quebec, despite being surrounded by the Anglosphere, hasn’t ended up like Louisiana or Ireland where French or Irish as the primary native language is a distant memory, suggests that their efforts are successful.
You are presumably referring to the OQLF (a provincial institution, not a “Canadian” one) which enforces French as the dominant public language in Quebec. Given that Quebec, despite being surrounded by the Anglosphere, hasn’t ended up like Louisiana or Ireland where French or Irish as the primary native language is a distant memory, suggests that their efforts are successful.