This is huge. Not as a security device, but if this were the normal permission model on all iPhones (e.g. owners of devices get root on the devices they own... like a normal general purpose computing device) I could ditch my android and my mac and use an iPhone for everything.
I'm not saying this will ever happen, but in my mind this paints a bright picture of what the iPhone could be.
It's also a bit sobering as I'm quite concerned Apple is actually pushing the other direction in their shift from Intel to ARM.