I don't think it can... Rather I would predict to be a co-existing situation with bitcoins and banks. For example, I am using HSBC while I am using ANX, no conflict with each other.
I share the same option with you in the short term. However, it is hard to say in a long-term perspective. The appearance of companies like ANX will certainly bring large pressure to the traditional bank industry. Let's wait and see how everything moves on.
It can make banks only disappear if the Bitcoin is getting more popular and that is not the best case now because there are still a lot of people that still dont even know what Bitcoin is and that is the problem.
But maybe it will be only possible but around this time it will be not possible and it needs also some time.