WPA IS BROKEN!!!1
Okay it isn't, that attack is awesome, but it is a social one rather than a break of WPA. I bet it would work in a load of environments, I would be surprised if pentesters didn't already have it in their toolkits.
Really the OS should be doing much more to protect users from this class of attacks. WPA written today would not be vulnerable to this class of attack at all.
Reading: The Puzzle Palace, 802.11 Wireless Networks 2nd Edition, Packet Captures