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Mistaking user ID for password has the potential for bodily harm. Didn't anyone see Minority Report? Do you really want to create a world where criminals want to steal your eyeballs? Thinking of biometrics as a replacement for passwords is one of the STUPIDEST and MOST DANGEROUS of all security mistakes!

User ID: Public, anyone can copy it, never changes, but you don't try to keep it secret because no one can hurt you with it; they would need your password.

Password: Secret, no one else should see it, must be replaced every six months.

You really want to replace your eyeballs every six months? THINK dammit before you spout nonsense.