While English might not be the language that is used by the most people on earth, it is the most important international business language. If you are doing research, you will find most works being in English already.
The English Proficiency Index has just released statistics on where English is learned around the world and quality of teaching to find the countries with the highest proficiency of English as a second language:
Malaysia should never need to debate on the need to use English is Maths and Sciences, plus boost up the teaching of the English language, and reading of important novels and literature. It is a critical part of being connected to the world.
Imagine a pure Malay speaker, and another who commands both Malay and English well. Imagine how they would be using the internet - socially, for researching, for reading of articles, for communicating with friends and family, etc... one would be swimming in a pond, while other has the oceans of the world to dive into, for fun, for knowledge, ... the English language allows for options to be available to them who can use them well.
Look at the table, why are we even on that table ... when you are a small country without a critical mass of consumers ... you need English to attract investments, to sell, to gain knowledge, to participate etc...
Yes, there are countries that do well with little or paying scant attention to English - China, Japan, South Korea, Russia... etc.. thats because their population base is big enough.
There have been prominent scientists, CEOs and high standing managers at global multinationals ... from Malaysia ... without English, those roles would never be an option for them.