> I agree - this is the type of vulnerability that, assuming Apple is extremely careful about protecting their signing key, is only exploitable by court order or similar state request.

Apple has been trying to prevent jailbreaking for years - they've always failed, so I'm skeptical about this "only exploitable by court order" bit. Determined people will find ways around the protections. Heck, it is even possible that someone (think nation-states) has already found a way to circumvent the passcode lock. This will only lower the barrier of entry.