I don't think banks will ever disappear because a lot of people don't trust themselves, so they like to put their money into someone's hands under a contract, so they manage their money for them so if they screw up they can have someone to blame to but them, of course then when the government take their money and they can't do nothing about it they will complain.
Banks will not disappear but bitcoin will dominate, bitcoin is unstoppable and banks are already threaten about the market bitcoin will get.
People will surely adopt because ti's a good investment and a better currency, if they are smart they are already investing now so in the future they can get profit. Banks will always be centralized but decentralized are better.
true and bank will not dissapear because people still need to save money use payment by fiat money and transaction with bank, because not all people know bitcoin today