It really doesn't matter for the sport. If a league offers a paid subscription service to watch events, I have no doubt they'll do everything in their power to shut down streams.
http://www.ice.gov/news/releases/1202/120202indianapolis.htm
"Website seizures
Furthering HSI efforts to combat counterfeiting and piracy online, special agents seized a total of 307 websites. Sixteen of the sites illegally streamed live sporting telecasts over the Internet, including NFL games. Two hundred ninety-one website domain names were illegally selling and distributing counterfeit merchandise.
Additionally, Yonjo Quiroa, 28, of Comstock Park, Mich., was arrested Wednesday by special agents with HSI. He is charged with one count of criminal infringement of a copyright related to his operation of websites that illegally streamed live sporting event telecasts and pay-per-view events over the Internet. Quiroa operated nine of the 16 streaming websites that were seized, and he operated them from his home in Michigan until yesterday's arrest.
The website seizures during Operation Fake Sweep represent the 10th phase of Operation In Our Sites, a sustained law enforcement initiative targeting counterfeiting and piracy on the Internet. The 307 websites are in the process of being seized by law enforcement, and will soon be in the custody of the federal government. Visitors to these websites will then find a seizure banner that notifies them that the domain name has been seized by federal authorities and educates them that willful copyright infringement is a federal crime.
American business is threatened by those who pirate copyrighted material and produce counterfeit trademarked goods. Criminals are attempting to steal American ideas and products and sell them over the Internet, in flea markets, in legitimate retail outlets and elsewhere. Intellectual property (IP) thieves undermine the U.S. economy and jeopardize public safety. American jobs are being lost, American innovation is being diluted – and organized criminal enterprises are profiting from their increasing involvement in IP theft.
Since the launch of Operation In Our Sites in June 2010, the HSI-led National Intellectual Property Rights Coordination Center (IPR Center) has seized a total of 669 domain names."