It's not about the language of the internet, it's about the language in which the most influential books and papers are written. If you can't read ACM papers or IEEE specifications you're at a disadvantage whether or not you're selling to English speakers. If I were to build a car and the best resources were written in Japanese I'd be at a disadvantage even if I was working for, say, a Swedish outfit.

Since most researchers relocate in the states and subsequently publish their findings in English there's no doubt that the best sources of knowledge are written in English.