Angel 8
I never said anything about being speaking English means you’re above anyone else. It’s not only about learning the language but also visa requirements.
If their pay is cut, to make it unliveable, they can’t exactly ask the government for financial support or subsidised housing.
If they decide to change jobs, then they’ll need to find an employer who will sponsor their visa and most positions (depending on your qualifications and experience) may require the ability to read and write Canto/Mandarin.
If they can start their own businesses to sustain them, then good on them.