@Anycrispsleft
I'd be very surprised if you couldn't get the same perspective and language learning skills from learning a modern language. And with modern languages there's also the massive advantage of having access to newspapers, film, TV, and to native speakers.
Exactly, I'm with you
@Anycrispsleft
Rather than wasting years on a language nobody speaks, because it makes learning other languages easier, why not spend those years becoming proficient in a languages you can actually speak to people and learning about countries you can actually visit and experience the culture?
The main reason Britain struggles with MFL is because we start far too late. Teaching 11 year olds Latin is not suddenly going to make them better at learning French and Spanish. Introducing foreign languages at a young age, infant school or even nursery is proven to make it easier to learn other languages later on. By secondary school age your brain has already lost a huge amount of ability to learn to pronounce new sounds.
Other countries know this and teach MFL as a priority from very young. Hence why in some countries eg Netherlands it is not uncommon for people, even those with no higher education, to speak English, French and German fairly fluently.
I know several children aged 3-5 who speak 3 languages because it is relatively effortless at that age to pick it up. It gets so much harder the older you get.