Earlier quoted context omitted.
Oftentimes, foreign citizens working in the US are not able to freely participate in the job market. If they can't freely move from job to job (as US workers can), then they will be paid less money. If they want to be in the US badly enough, this will still be their best option. Everyone wins except the local worker who is now competing with an indentured servant. [0] Indentured Servant is probably an exaggeration: b…
Most visas (in particular, the OPT in question and the H1B) allow very easy work-permit transfer to other employers. So the wage decrease won't apply here.
I don't know about the OPT thing, but H1B situations vary[1]. If Obama and his advisers can change the law such that no tech person can be entrapped by the H1B visa shenanigans described in the article I linked, I see no problem here.
1. "Even immigration experts have trouble sorting out how the brokers manage to game the system. From 2000 through 2013, at least $29.7m was illegally withheld from about 4,400 tech workers here on H-1B visas, US Department of Labor documents show." --- http://www.theguardian.com/us-news/2014/oct/28/-sp-jobs-brok...