I can't imagine that anything less than subdermal implants will be reliable, for some people.

If the implant fails, you can just go back to the government office / mega corp, show your DNA, and get a new one.

On further reflection, person a) has an evil twin who steals their identity, and person b) doesn't trust the government / mega corp. Back to the drawing board.

> People are constantly losing their keys prolly about as much as people reuse the same password for multiple services.

But when they lose their keys, they have a pretty clear mental model of the security risk and how to mitigate it.

What happens when you lose your passkey?

Exactly.