This seems like an argument for forcing graduate students to take a second language, and keep up with work outside English.
This seems more like an argument for graduate students in other languages to read and publish in their own language or just not in English.
Edit: When I wrote the comment, the quoted part was in the parent and not a seperate comment.
Related: Loss of local knowledge affecting intellectual trends, The Hyborian Age
This post is from Gregory Cochran's and Henry Harpending's excellent blog West Hunter.