I wish it weren't the case but I doubt they will be going after people downloading pirated porn. It'll be the mainstream stuff owned by the big media companies which gets protected and it looks like mainly torrent downloaders will get hit.
It would be great if they did this to users of file lockers and tubes with stolen videos but I seriously doubt it. If it happened I bet we would all see 30%+ jumps in paysite revenue within a month as people decided to start paying again rather than risk it.
But it will still probably be open season on porn as usual.
But who knows if some of the big adult content providers remove their heads from their asses and put pressure to get equal protection maybe something can come of it for us?