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No, the disappearance of banks is impossible in any scenario. The banking system serves the economy of the state and therefore is an integral part of the state. Therefore, banks have nothing to fear. They will use the cryptocurrency as much as it will be profitable for them.
Though nothing is impossible; but it is true that we do not see an end to the Banking system in near future i.e. we may say for the coming 25-30 we do not see disappearing banks.
Also it is true that if the latest developments are accepted and adopted by the banks then there will be no fear for the existence of the Bank's existence even for 100 years to come.