This is something I've seen spouted more and more by copyright maximalists over the last few months...basically a variation of "ISPs need to follow the law and terminate repeat infringers!"
And of course, since they're not doing it - or so the maximalists believe - ISPs are also profiting from piracy.
I understand that the DMCA (sorry, don't know which part) requires that service providers have a repeat infringer policy, but is there something in the law that says that infringers MUST be disconnected? I mean its just a policy, right?
Also, could the RIAA take the ISP to court for not terminating somebody? Is this why so many ISPs agreed to this "voluntary" plan (Yes, Mr RIAA, don't sue us and we'll disconnect whoever you want. Sure, we'll lose them as a customer but we'll sure save on those legal bills!)?