Firstly from my view I think when someone decides to learn a new language should they ask their self what will be after I learn this language , I mean when a person wants to learn language there usually some causes , as for me I have been studying English , because my university requires me having English to join to them
. other people probably because to work on a jop or travel or living abroad .
Greetings
As for English in particular, one should learn the language if he is able to, as it is perhaps the most universal language and could hence prove useful in many situations.