If anyone wants to get an idea of the future where fiat currency is dead and buried, and bitcoin rules, then it is worth seeing the movie "In Time". It is very watchable and Timberlake's acting is pretty decent. However, for bitcoin fans, there is a visual metaphor showing a universal peer-to-peer currency system in action.
These substitutions can be considered:
a) The units of time which can be exchanged, lengthening lives, could be instead be bitcoin. 1 second = 3 satoshis. 1 year = 1 bitcoin.
(The vault at the end is Mt.Gox :-)
b) Implanted graphene sheets in each person's forearm are a digital wallet enabling proximity transfers (say by RFID bluetooth)
c) Discount the dysfunctional future society. It is worth being an optimist about the future - especially one which is founded on a robust monetary system instead of the fiat madhouse we have today.http://www.imdb.com/title/tt1637688/