Dont see any problem about anonymity.. Using bitcoins, cash and a palm scan : none is tied to an ID at all.. It's just an image recognizable to make a user unique. Anyway, you can always ask a friend or anyone passing by to put his palm on the scan and yours will not be scanned.
Tha national TV broadcasting here in Quebec/Canada had a clip about it in the news.. at Radio-Canada : http://www.radio-canada.ca/nouvelles/Economie/2013/10/29/005-distributrice-monnaie-virtuelle-bitcoin.shtml
Or, you can have a supply of palms on hand (no pun intended) in case the exchange rate dictates that several $3000 are in order. How hard is it to fabricate fake palms?
I too wondered where I would find a second palm.
What if a Bitcoiner doesn't have any arms/hands? Is s/he discriminated against?
idk maybe he could handle stuff with armory