Many of the devs have already said that it is possible for Sony to block/detect this via a frimware update. Yet, there's been no mention of one from Sony. Granted there probably will be one coming, but there's usually talk of one before it hits the streets.
It's odd to me that Sony is putting so much time/money into lawsuits over something that is already in the wild. Maybe they are just going for damage control, but it's inevitably out there now and can't be feasably stopped. Sony can't control/sue the entire world. Many countries laws would rule against them. Maybe they are just hitting the major countries to try and set a precedent.
However, we've already seen how crazy Sony goes over the mere mention of a possible hack (r.i.p. OtherOS). So I guess it's not agains't Sony's nature to go overboard on something like this. I would think that a company that big would have enough sense to know when you've been defeated on something.
See, this is the part of it that's interesting to me.