Hackers may not 'care' about our personal information but they did it to piss us off. So in a way, they do care. If it wouldn't get them the reactions they wanted, they wouldn't do it.
With Sony telling us, it's letting us know that we have to be careful and watch our stuff.
You don't really know if they are going to attack a credit card just to piss people off more or what.
Hackers are hackers. These people are B*****ds who don't give a s**t about how we feel. They just want to make themselves feel like they are actually doing something to better their own lives by fing with ours.
However, I don't see this as that huge of a deal. Sure, I can't play online but oh well... I don't play online games except WKC. It doesn't stop me from playing my games but oh my god! I can't update trophies. Oh noes!
If people stop freaking out about it, the hackers will get pissed we aren't complaining and sooner or later after some ups and downs and more hacking they will get fed up with our lack of reactions and eventually they will give up. Yeah, they'll come back but if you ignore it...it will go away once again.