[Spivak]

A single point of failure for what? If you lose your physical ID you don’t have a failover; same with your credit cards.

Having copies of your cards in your phone actually makes the whole system not a single point of failure.

[spacexsucks]

I see that once there is the digital "more convenient" way, the paper way will go away and the fight for it will be hard.

Also, ifyou are out with only a phone and no battery, there is also no failover.