Definitely ATM would bolster up the use of BTC. Who wouldn't want to withdraw cash directly from their BTC Wallet in case of need. The problem with such ATMs as of now is just Legality. Last I remember that an Indian exchange tried to set up an ATM in Bangalore and the very next day Reserve Bank of India arrested the CEO of that exchange and he is still serving a sentence. The problem was using the word ATM because ATM can only be opened with a prior permission from RBI. This changed it into a criminal suit and was fed up by charges such as fraud and unfair use of people's money etc. So I would say bitcoin ATM is a wierd idea all in all.