Right now there is no such thing the can challange the banks. Their monopoly is just to strong.
Perhpas if some big wall street firms step in with bitcoin venture we can see this happeningMany people need some normal banks. Some people doesnt even know what Bitcoin is.
So how it is possible to make the banks disappear. First we must introduce Bitcoin to them and that it is maybe possible later in the future. Do you think so ?
All the big banks are already looking into blockchain technology and will be using it for money transfers within their own banks very soon i believe. The problem for bitcoin is that these banks only want the blockchain technology not bitcoin, they will most likely look to create their own coins down the track.