I doubt wikileaks called for a DDOS attack but they are probably happy. As far as Wikileaks being illegal so MasterCard and Visa cuts off service, will they stop working with New York Times, The Guardian, Spiegel etc? So far no US court has declared Wikileaks illegal.
Visa and Mastercard made a business decision to please US regulators, something that we will probably pay in a way or anotherwhen favors are returned, so they should deal with the consequences. That's how the internet is now, somewhat of a wild wild west.