That immediately puts non-English speaking universities at a huge disadvantage
How so? I studied at University of Amsterdam, everyone spoke English at graduate level and everyone published in English. Many faculty where not even Dutch. I would expect the same from any international class university.
I really doubt that. I am sure we can both provide anecdotal evidence, but there is no way 100% of papers are published in English. And you picked a very specific example, because an overwhelming majority of Dutch people speak English at a very good level.
How so? I studied at University of Amsterdam, everyone spoke English at graduate level and everyone published in English. Many faculty where not even Dutch. I would expect the same from any international class university.