I imagine the main potential source of expense would be covered by them still being considered DMCA safe harbors. So long as they're still considered a "mere co

I imagine the main potential source of expense would be covered by them still being considered DMCA safe harbors. So long as they're still considered a "mere conduit" the most you can compel them to do is stop providing service to an infringer (see three strikes systems some ISPs use today).