psn can be hacked again ?

[The Shadow™ ®]

technically it's possible , no network is going to be 100% safe forever , with new software or techniques or enough time any network can be hacked including the banks , government and military networks
that said Sony built a new server system in a secure building and beefed up their firewalls and newtwork as well as they possible could , spending hundred of million of dollars to secure psn and its as secure as you'll get nowadays

hackers are more likely to get your information off less secure sites like twitter , facebook etc. than off psn and you are probably have posted your personal information on those sites already for all to see
you will never lose your account even if sony gets hacked because the hackers that do these big network hacks are after credit card info nor your account and the few games on it
the only way you'll ever get your account stolen is willingly tell someone the password and e-mail trying to game share , not from anyone that might hack psn at some future date that might never come .

There is only one way to be secure online , never use social network sites and if you do never let your account be public , and never post any personal info on any website including not telling someone your city , state , real name , e-mail , your birth date , parents names , school name , and never use a credit card online if you can buy things like psn cards and prepaid visa cards
as long as you know your psn account e-mail and password and never tell them to anyone else you have access to your purchases and account