There is no 'to risky to risk piracy' point. They'll just dive into the darknets and be harder to find by everyone except who knows enough.
It's going to seriously dissuade casual pirates and it's going to be the death of public torrent networks. Which are really the distribution hub of piracy that allows 1 copy to become 300,000 copies in 3 days.
I'm not talking about people tech-saavy or committed enough to go to darknets....just like when talking about murder or drugs I'd be excluding people who are committed enough to do murder or serious narco-traffiking. (And no that's not a qualitative statement about piracy in any way.)
Content sharing has become easy enough now for even non-tech saavy people to do it. Client, link to a tracker page, boom. You're in. That's what the industry perceives as a threat to its interests. CISPA would reset the bar for how much technical knowledge you need to pirate in anonymity, and I think that's the real goal. In private I don't think they're so deluded they think they can stop piracy. But they want to control the volume, and forcing people to go off the grid to do it would drastically cut down on the amount of infringement, because I think most people aren't committed enough to learn how to work off the grid just to pirate movies, song and games.
Plus, once a darknet starts having users who don't know each other connect to each other, it's not really a darknet anymore. It may be inaccessible by the general internet, but it's really just a large private network at that point. And those can still be hacked and accessed. (Because that's the next logical step for the intelligence agencies.)
If anyone is more likely to go to those places to seek anonymity....my guess would be its gamers. The amount of technical knowledge you need to install a cracked game is higher than what you need to download an mp3 or movie and double-click it. (Not by much in my view, but still more.)