Actually most people west of Ontario don't bother to learn French simply because there is no need for it and nobody to speak it with. In B.C. it would be better to have judges that speak Chinese. White people of all languages are now a minority in the Lower Mainland.
But then since there is no real difference between the two Eastern parties it doesn't surprise me that they kiss ass in Quebec where most of the votes are and to hell with the Western half of the country.
How is this kissing ass in Quebec? Most Quebec lawyers won't be eligible as well, since I assume most of them are not fluent in English.
But I can see PMs getting around this. What they may do is that they may appoint an English lawyer who knows French a bit, but is not fluent at it. Then they may make it a condition of appointment that he must become fluent in French in a year or two.