But science is already its own language and nothing much is lost if most scientific publication is in English. Convenience is gained.

I agree. However, there is one major drawback. As many scientists publish in English only, even if it is not their mother tongue, scientific languages other than English do not develop further. This may result in problems in teaching science. More and more english words are used untranslated in other scientific languages.

Therefore, I prefer those journals which are bilingual. However, there are only a few of those.