On the anniversary of the Supreme Court Grokster decision there is an article on AP covering developments during the last year. After the decision

Andrew Lack, then chief executive at Sony BMG Music Entertainment, predicted at the time: "We will no longer have to compete with thieves in the night whose businesses are built on larceny."

And since then?

The average number of simultaneous file-sharing users was about 9.7 million worldwide in May, with about 6.7 million from the United States, according to BigChampagne LLC, which tracks file-sharing activity. In the same period last year, BigChampagne tracked 8.6 million average users globally and 6.2 million in the United States.

So I guess we can conclude that file sharers aren't "thieves in the night whose businesses are built on larceny."