Reply #7: Existing Australian advice for Australian tourists visiting the United States [View All]

In 2008, US Immigration and Customs Enforcement (ICE) apprehended 791, 568 foreign nationals and removed 358, 886 from the country. While waiting to be removed, an overstayer will join some 32, 000 other illegal aliens detained in facilities nationwide where they may have to wait several months before being removed. There are some 17, 500 Border Patrol Agents in the United States, 89% of which patrol the border with Mexico. If you are travelling in Texas, New Mexico, Arizona or southern California, expect to have your documents inspected by authorities without warning and on a random basis, including on public transport. For further information on the penalties for ‘overstaying’, see the Entry and Exit Requirements section below.

From http://www.smartraveller.gov.au/zw-cgi/view/Advice/united_states_of_america

I don't see that anything will change.