I seem to recollect that about 20 years ago, this concept was being discussed: you are issued a card (similar to a PP CARD), but all VISAs and entry/exit "stamps" would be stored ELECTRONICALLY on the card. With the advances in computer technology today, shouldn't this be the "wave of the future"?
It could or should be that way but then again, as demonstrated by the American/PSA Airlines system crash, I wonder about dependability. Maybe we’re not there yet. Maybe some third world countries are far from being there.