Have we seen this fingerprint reader yet? IBM/Lenovo ThinkPads use a reader that's just a tiny strip, so you actually have to swipe your finger instead of just planting it on the reader. This at the very least defends against simple attacks.

But I mean, a fingerprint is a physical thing which can be cloned, just like a key. And you also leave prints everywhere you go. It's not a silver bullet in authentication. All else being equal, passwords are safer against a determined attack, if we can assume correct usage.