Monolingualism starts to sound like a disease

On native speakers of English:

Not only do the majority not speak languages other than their L1 English, but they also tend to be less competent than many non-native speakers in their acquisition and use of accommodation strategies, and instead expect non-native speakers to make all the adjustments. This may in part be the result of their monolingualism.

in the near future, those who occupy the top of the English language hierarchy will no longer be native speakers of English, but bilingual speakers of English who have the skills to function comfortably in multilingual communication.

--Jennifer Jenkins, in her article, "Exploring attitudes towards English as a lingua france in the East Asian context"