In the 80's, I was told we would all be speaking Japanese very soon, and I needed to learn it.
In the 90's, it became Spanish.
In the Aught's, it became Chinese.
We're not all speaking Japanese, and in the US, unless you're in landscaping or the fast food business, how often do you need Spanish?
Don't pay attention to the so-called futurists that have such a great vision of future society. Pick something you like and go for it. I grew up in the Western US and learned German in high school. Never did me a lick of good until I went to Germany for a few days this past summer, but it was fun to learn and close enough to English to not be hugely difficult to learn. Learning Hebrew's on my list this year. It's pretty much going to be useless because I'm not Jewish, but what the hell. It's interesting to me.