Everyone studies Chinese?

If everybody speaks Chinese

I think I can find a job easily in other countries, if everybody starts to learn Chinese, I guess they might be confused about our grammar. I agree Chinese's grammar for foreigners is difficult, sometimes I confused it, too. Also, they might think Chinese's words is hard. My main language is Chinese, I often can't remember how to write some words. 

if everybody has to speak Chinese I might build a Chinese cram school but teach them because my Chinese is not as well as a Chinese teacher. This will be a big cause. To provide Chinese quite good, we can let more people about us also they can know Chinese culture. 

So when would we have this situation? I think it would be world war 3 then China wins and has a term that other countries must learn Chinese. otherwise, it's hard for this day to come. People have their own language then made for a country.

so if everyone speaks Chinese or if everyone wants to learn Chinese
I think it would be very interesting.

PENNY'S MUSIC: 該死的溫柔-王嘉爾