Any plans to use DNA instead of NFC?
We might forget our NFC-enabled phone at home but we won't forget our "DNA-enabled body" at home.
(inspired from this futuristic video: http://www.youtube.com/watch?v=dGCA7FWF1pk)
Not quite the use of DNA but a step towards it is being worked upon by using a personal area network to facilitate bootstrapping a secure exchange.
Have a look here: http://www.ego-project.eu/egotechnology and here http://www.ego-project.eu/egotechnology/intra-body-communication
So as you can see, an interesting next step is already being thought out...