Encryption isn't about making something impenetrable, it's about making it more difficult. For example, modern encryption is very difficult for present-day comp

Encryption isn't about making something impenetrable, it's about making it more difficult. For example, modern encryption is very difficult for present-day computers to crack, but won't be that hard for quantum computers to crack. Also, you're discounting the possibility of multiple layers of biometric + non-biometric authentication. Password/Private-Key + retina scan + left big toe-print scan >= Password/Private-Key. I also think there are ways to authenticate your identity outside of static data-points if there's a trusted 3rd party real-time system involved.