My dad (that is a excellent programmer, and tried very hard for 20 years already to learn english and failed) disagree with you.
How is one or even a thousand persons' inability to learn another language an argument for how science should be practiced?
As technologists, maybe we could find solutions that, ya know, don't force massive, life altering requirements on billions of people?
It's not hard to speak at least two languages and one of them should be English.
There is no solution as good as the whole world being bilingual.
I remember in uni taking "German for technical and scientific reading" courses just for that purpose. It make much more grow the communities than shut most people out because they don't speak English.