The government can buy iPhones by the thousands and hire all the help they need to crack Apple's security. Question then becomes, does Apple want to do this themselves and have control somewhat over the process or yield all that control to the government who'll probably outsource it to India?
apple is most likely developing the next IPhone with new security features
The next iPhone (the 7) is, IIRC, already in the pipeline...and yeah, I'd guess the security has been upgraded.