defensive patents were not eliminated. There is still, for example, RPX corporation (http://en.wikipedia.org/wiki/RPX_Corporation) which does "active" defensive patent protection in a for-profit model.

What was, however, eliminated, was the Statutory Invetion Registration: (http://en.wikipedia.org/wiki/United_States_Statutory_Inventi...) For this reason: "Since the adoption of the eighteen-month publication procedure, the use of SIR has decreased substantially, and the America Invents Act eliminated this tool for inventors." (http://www.aiarulemaking.com/rulemaking-topics/group-3/repea...)