When the world offers you endless numbers of reasonably well-trained workers who can fill your job openings at 1/2 the cost of US workers, what is a country to do? How long can a country resist that pressure? We may politically shout for better wages and training for US citizens to fill these jobs, but the deeper issue is that borders/barriers are less and less effective lately against a flood of competition from people who are cheaper and better (or hungrier).
Americans I believe will have to come to grips with the possibility of a stagnant or even decreasing standard of living as the rest of the world takes what was once our position. No amount of restriction of H-1B visas will prevent that.