Comment by sateesh

What you are proposing is too sweeping, it is not just privacy that suffers. Making a single ID (whose attributes can't be changed) an entire identity of a person is a very risky one. This makes it a single point of failure and in cases like an ID theft, misuse the affected person suffers gravely, and onus will be on them to prove who they are, a Kafkaesque nightmare it would be.