Quote Originally Posted by Unknown Entity View Post
One card that can hold everything would be pretty neat. Imagine having all your memberships, bonus, credit cards all on one card? Would be completely buggered if it was lost though.

Moblie phones are getting smaller and smaller as time goes on. A thin, flexible one will be out eventually.

As for keys? You're on your own.
I think it's very possible. Think of a slender phone model (much like the current ones on the market), with a scannable backside that acted as a credit card. Do away with cash (almost everyone takes credit card/debit cards now in the US). The scanner could also work as a door lock or car lock (although I see that being an issue already).