OTOH, if a critical mass of great developers went back to their countries of origin (assuming they want to live there), they would be able to earn US-level sala

OTOH, if a critical mass of great developers went back to their countries of origin (assuming they want to live there), they would be able to earn US-level salaries there (probably less than what they earn in the US but comparable after subtracting cost of living and taxes). Also taxes would go to their countries as well instead of IRS (not sure if it's good or bad though, depends on the country).