It could see the community and bitcoin users from year to year continue to increase, because of the simplicity to the sophistication offered bitcoin. This will certainly affect the use of the bank, but I think it will take a long time.
I think so .It will happen ,but require some more time to happen. Since many use bitcoin for their transaction, their is the possible for that.For that to happen, bitcoin have to replace dollar first.Then the entire currency system and then the bank process. Finally the entire bank work such as deposit, withdraw ,loan and so on.
It won't happen, there will be institutions like banks around in the near and the far future. There probably will be co-existence and its, imo, highly likely banks will adopt some form of crypto-currency in the very near future albeit I highly doubt it's going to be BTC due to its decentralised nature and the fact that its use case specifically intended to cut the middle man, ie, banks and other institutions, out.
You have to keep in mind that none of the crypto-currencies, as far as I'm aware, have any significantly sized lobby group that wields influence in any sovereign nation. If banks tomorrow decide that crypto's are a real threat, how long do you think it would take for governments to adopt rulings and laws that will heavily tax or outright ban crypto-currencies?