Ha. Look at some writeups of the SoCal Edison outsourcing, for example. U.S. citizens making $95K were replaced with H1-B workers earning $60-65K, and that's generously estimating the lower salaries. Tata and Infosys might pay their workers closer to $40-50K.
They're currently under investigation for violating the immigration labor laws surrounding the H1B [1].
It's a different problem than the cap or the problem in the article. You're always going to have agencies trying to abuse a system regardless of whether there is a cap or not, and they will be investigated and penalized accordingly.
http://www.natlawreview.com/article/commentary-tata-consulta...
Meaning if there was a cap (or no cap), there would still be enforcement making it a non-issue.