A friend and I were discussing this kind of thing recently. As Mr. Doctorow says, “about time.”
Of course, the case has almost zero chance of ever getting to court. The RIAA has a history of settling such counter-suits (as well as any lawsuit they bring, if it looks like they might not win) long before they can get that far, and ensuring that the settlements can never be revealed. If even one person actually wins against them, it would all but destroy them overnight — they wouldn’t be able to convince anyone to go along with their racket anymore.