This argument would be valid if USA companies couldn't open offshore offices. Tech employees are earning salary comparable to USA salaries, working for USA-base

This argument would be valid if USA companies couldn't open offshore offices. Tech employees are earning salary comparable to USA salaries, working for USA-based company, but not paying taxes in USA. If USA won't adapt their immigration policies it's matter of years until different place with reasonable immigration policies and friendlier government will gain status of Silicon Valley.