The banks are already afraid of bitcoin, due to the fact that it might soon make them obsolete. Banks have already seen what the blockchain can do, and with bitcoin into the play, their industry of capitalization might just be rattled. They wont be able to charge us enormous interest rates, and we all would just be using bitcoins, money for the people, by the people, of the people. For now, banks just will be  wary of BTC's rise, as mass adoption rates arent too high, but in the near future, they should be afraid I guess...