> Also a big deal if you consider that most of them are the wealthier, smarter, more mobile parts of the population, which will exacerbate the brain-drain and impact the economy.

This a post-Covid era. Everything that is "smart and mobile" is also remote. Which means that physical relocation doesn't exactly imply brain drain, especially given that wealthier destinations such as the US or some parts of Europe are harder to reach then ever.