Bitcoin's killer application is to give a chance to the people of under developed countries to the ban services. What am I talking about?
Well there is more than 3 and a half billion people who don't have a bank account in the world and who don't live anywhere close to the bank. With a simple and cheap phone, with the Bitcoin miracles can be done.
I mean look at Mpesa in Kenya and the success of it. Bitcoin can be next Mpesa, just hundred times bigger!
now that i think about it , i find this very interesting. it is one of the best benefits of bitcoin for those people who either don't have bank account or don't have access to paypal, credit cards which every popular place for example amazon is accepting.
but i don't think it is going to be the killer app , the effect is small on bitcoin in this matter.