Public not interested
The general population in America is not concerned about brain drain or entrepreneurship. As long as Dancing with the Stars, or American Idol is not affected. As long as the next iPad, iPhone, or 4G device is available they don't really care where they come from. It is only when they can't find a good paying job they get concerned, and who do they blame, immigrants. It is easier to blame them, than work at getting a good education and working your way up.