NFC is an acronym for Near Field Communication. Companies like Google have been at the forefront of introducing this technology to enable our mobile phones to be used as mobile wallets, keys and other access devices for a few years now.
Perhaps the future of mechanical keys is limited although, with respect, I believe that maintaining the mechanical key option will ensure you can still operate your lock in the event of electronic or battery failure.
With the world starting to embrace wireless electronic security, it is still not as green or environmentally minded as pure mechanically operated keyed locks and handles.
Many consumers may enjoy the convenience of not having a key to use or lose, however the ongoing maintenance cost and service costs massively outweigh the little cost option of mechanical keyed systems.