This is impossible!
People have more trust in banks than in bitcoins.
Humans believe more in physical things than in virtual. Young generation is still more adaptable to virtual world but older ones are adamant towards baking system.
Some time back, people said that Bitcoins will never reach $100, it reached, they thought it would never go $1000, it went way above it...
Never underestimate the power of such technology which has Microsoft using it, they must have something in mind when they chose Bitcoins...
So do you think if bitcoin will reached even at $5000 or $10,000 price, it can be a factor that it can make banks dissapear?
We are not talking about the price here. If we are only basing on the bitcoin price as a major factor to make banks dissapear, it's really non sense.