Which language would be most required in the business world in future 20-30 years? I know english will be the first, but which languages go than?
When you're living through a Paradigm Shift, the one thing you know for certain is that you don't know anything for certain. I'm reading a sci-fi book written by a renowned author (Gordon R. Dickson) a mere 25 years ago, when the Paradigm Shift into the Post-Industrial Era was well underway. His depiction of the technology of this century is just pitiful. No cell phones, no magnetic stripe readers, no internet, etc. Even he couldn't see what the world would be like in a mere 25 years. I'm always amazed when I read books of that vintage that assumed the Cold War will still be going on in 2050 or 2100.
So don't expect anybody to know what the world will be like in another 25 years. I make absolutely NO prediction that English will still be the world's leading language. Mandarin has twice as many speakers and until last year China's economy was growing much faster than ours. If there's a war and we lose, your children could be speaking Arabic, Farsi or Urdu.
I know Spanish is very much used, but I hate that language, really dont like how it sounds...so what is the third most used language in engineering/business world?
Even without a war the world will still change enormously, in ways we can't imagine, because the information-based economy will rewrite the rules. Spanish does seem like a good bet and if you're serious about planning your life then I suggest you just suck it up and get over your prejudice toward Spanish. At least it's fairly easy to learn. When I was a kid people wanted us to learn Russian, which is almost impossible.
There's currently a huge need for people who know the major languages of the Middle East: Arabic, Farsi, Pashto, Kazakh, Georgian, etc. Of course that's in government work, not in the business world. You'd probably be set up nicely for the next 10-20 years if you become fluent in one of those languages so you can translate documents, radio broadcasts and phone calls.
The CIA only recently caught up with its backlog of intercepted documents from the 20th century. Until now, they were biting their nails, wondering if a full-color PowerPoint presentation laying out all the details of 9/11 had been sitting in the bottom of some overworked translator's in-box since 1997.
The Army just fired a bunch of translators because they were gay. I'm so glad they're protecting us from evil.