Just not indigenous languages of the British Isles?
My son will have to be proficent in at least three to four modern languages if he wants to get a decent paid job,when he is an adult, where we currently live.
Four languages is his bet bet for maximising his opportunities if he wants to live/studywork elsewhere.
We (as in my family) can't afford to prioritise the indigenous languages of the British Isles at the expence of modern laguages, given the heavey language load expectations of the wider employment market.
If people think that English is enough and Britain will provide all the opportunities they think their kids will ever want or need then fair enough, they can afford to treat MFL like optional extras and choose something else.
However! If I could go back in time to my son's primary age, I'd happily swop my son's art and/or music lessons for sign language. Actually you can have both, source of constant grumpiness and tears those two were, been much better since he dropped them and he got to learn guitar with his own teacher.
Oh yeah, and RE, I'd swop that for sign language (if the school could afford the training and any required resources obviously)
But that is the problem really, different parents will see different subjects as priorities and would throw the mother of all hissy fits if the subjects I don't give a toss about were being swopped out in favour of something that they weren't opposed to...right until it threatened something they deemed invaluable for their child.