Correct. The question is what, precisely, you'd use to bet against the student loan market. Since of the people who "successfully" shorted real estate found themselves running into trouble cashing out because the same institutions they'd bet against got hammered when housing popped and themselves defaulted. How do you successfully bet against the stability of the world-stabilizing fiat currency---the one other countries jam under their mattresses to back-stop against domestic economic turmoil?