What has he been given then op? If French is one of four outside the usual compulsories, can one of the others give so he can do geog and history?
Interesting points here about MFL; I taught MFL and worked in such an ace department, could be one of the reasons as many as half the cohort picked an MFL for GCSE. But yes, I agree, it's not always so well taught.
I think there is a perception that it's difficult, and in fact the new GCSE, while undoubtedly better than the ridiculous coursework-based one it replaced, is harder, and the way it was introduced has not helped this perception (tho I guess this is true to a greater or lesser extent with other subjects too). The exemplars and actual exams last year and this were certainly tough, and imagine yr 11s tell their yr 9 siblings so. Never mind that grade boundaries might reflect this, the damage is done.
In addition, not only are MFL teachers faced with "but I'm never going to go to France!" (let's hope this isn't true), there is also the undoubted fact that people elsewhere all learn English and are happy to speak it. Of course they learn it, it's the obvious choice and crucial if they want to function on an international planet, or even watch the latest movie. It's less obvious what English speakers should learn, and this fragmentation doesn't help.
All this makes me so sad. I'm just back from a trip to Vienna, I LOVED speaking my German there. I'm sure all the waiters and museum staff has fab English, but they seemed happy to speak German with me, I even had a few jokey chats with people in TL. I just wanted to offer that experience to my pupils. It's very depressing, the unceasing arrogance of those lucky enough to have English as their mother tongue 
Sorry Op, a bit off topic I know!