What will students who fail to get PR do?

An article in the Australian newspaper says that 'TENS of thousands of foreign students may try to stay in Australia illegally now that stricter rules have dashed their hopes of permanent residency.' It states that at least 100,000 students who had enrolled when the rules gave good reason to expect permanent residency could now fail to qualify for a visa under the new requirements. This number includes a sizeable number of Nepali students as well. Given that Nepalis are very resourceful when it comes to finding ways to extend their stay overseas, I wonder how many of the Nepali students (with no hope of PR) will decide to become illegals!