[CRASCH]

A back door is a vulnerability regardless of its intended use. There is no way to assure it can't be used elsewhere. I would be shocked if the existing decryption method used internally at Apple wasn't fully available to other agencies. How hard would it be for a three letter agency to get someone in the right position to obtain the keys and tools?

The closing of this vulnerability makes business sense for Apple. Considering how connected these devices are only, marooned data would not already be available elsewhere. Perhaps a photo that wasn't uploaded or a note taken. Everything else is accessible. Location data is available via cell tower logs. Voice calls, call history, SMS, email, web history, etc... all available already...