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Not all people speak english and many people speak multiple language aside from english but most large cities around the world have some bit of english knowledge
English is the language of business, the wealthiest entertainment outlets, and (most importantly) the internet.
If you don't operate in English, you're not a major player.
One of them
There's a few "important" ones based on he number of countries that use it as an official or second language - English, Spanish, Arabic are probably the main three. Russian, French, Portuguese and (probably increasingly so) Mandarin are also big ones.
It probably is inevitable that one will eventually takeover. The more people speak one language the more important that language becomes... which makes yet more people learn it out of necessity. That said, there's also increasing pushback and pride that people take in their own languages, so maybe others will be preserved. You see that in Malta (where my family are from), most of them can speak English but also use the Maltese language alongside it.
I love some of the signs in sign language. I was even thinking of posting something about it. Unfortunately even sign language relies on a shared context to learn and teach. And what if you can't see? Music can be used to convey emotion very easily. But there are only twelve notes in music. Imagine an alphabet that ends at L. insignificant for complex ideas. Also what if you can't hear?
It is already mandatory that all commercial pilots and air traffic controllers speak English anywhere on the planet.
watch greek , french , italian ,Television , when the pick up the telephone they all say 'Hello"