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That certainty breaks the Computer Fraud and Abuse Act, and while impractical, I think you could be charged separately for cracking each router. That said, interesting idea. If I were to do it, I wouldn't crack the passwords on the router itself, but rather attach 3G hardware to the router to "phone home" captured handshakes and run your cracking on GPUs in the cloud, sending results back to the router.

Probably cracking passwords would be very slow on router hardware - cool idea though.

The load could be distributed between nodes, or the original node could be backed by a more powerful machine to do the cracking.

Did you mean this?

http://gizmodo.com/264050/slurpr-wi-fi-box-sucks-up-six-sign...

It's called evil twin and if you thought of it more than ten years ago you would've had to write your own script.