Comment by Dalewyn

Passwords will never be supplanted unless the new challenger can satisfy all of the following:

* Easy to understand. (A password is just a word/phrase/string of characters only you know.)

* Easy to use. (Using a password only requires remembering and typing it in when prompted.)

* Convenient. (Only your ability to remember and type required. No other tools or gadgets required.)

* Simple. (All of the above.)

If something needs an essay to describe itself, it's not killing off passwords.