If you can speak a language, you can always speak another

Now, more and more people learn more than one language beside mother tongue. People learn the second language because of interest or communicate with foreigner, etc.
If you want to do business in China, it is a plus factor if you know chinese lauguage likes mandarin. Likewise, knowing Japanese will help grow your business in Japan.
It is very common now that private language schools offer more than two lauguage courses. On line lauguage courses also booming to cater the demand.
So, if you can speak a lauguage, you can always speak another.