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Haitian Creole
That would be the day.
Haitian Creole
But I don't think it's a majority.French. Africa is on the rise and many countries speak French on the continent.
Mandarin might be too difficult of a language to even get close to surpassing English.
Just listen to the underlying beats in most afrobeat song and you'll recognize the mainly Soukouss drum patterns
Face it a good 1/4th of this country is annexed/stolen Mexican territory. Some would argue they are reclaiming their land in a way.In America, Spanish
It's being taught in every school at every level, and now there are Spanish Immersion schools where they take every class im Spanish once they become fluent.
Hispanic will be the majority in USA in a few years, especially with how many kids they have

And despite those flaws they have managed to get this far surpassing many if not most European powers that had tried to conquer them.The interesting thing about China is that it was a superpower. It was the leader of technology. But due to stagnation and isolationism other countries surpassed them.
China today has a one-party system, serious environmental concerns, gender imbalance, etc. These are serious issues that prevent China from overtaking the US.

Spanish will definitely help if you have clients in Spanish speaking countries/communities or invest in Latin America at all or want to communicate with a substantial part of the Country.None. English will remain No.1.
On the real, there's no real reason to learn Spanish unless you are included in one of the following:
Most Spanish-speaking countries aren't anything to write home about economically, and don't have a military presence outside of their immediate vicinity. English, on the other hand, is spoken by two countries that were/are (Great Britain and The USA.)
- Live in a country where it's the predominant language.
- Live in SoCal.
- Desire to become a Linguist/Translator/Spanish Teacher.
- Have travel plans to a predominantly Spanish-speaking country.
- Want to impress Latin hoes.
- Wish to be the Orochimaru of language.
Mandarin might be too difficult of a language to even get close to surpassing English.