There is no such thing as a completely secure system, so there will always be hacks made if there is a high enough demand for them. If someone wrote a bruteforce program to bruteforce apple's signature on the firmware, it could eventually be cracked. It may take five years with 100,000 people running their gpus at max, but it could be done. I'm sure someone will break apples new updates either way, its just a matter of time.
its more like a ferrari, that runs like a ferrari, but without a jailbreak you can't listen to certain radio stations on the radio or change the color of the pain on the exterior, and you have to pay for gas.