Yes I think the bank will not adopt bitcoin as I am sure the bank continues to issue its own system. Bitcoin will not make disappear the bank because the bank has the power of government and as a reference for the economy of a country.
If the banks are allowed to use the bitcoin, they will use it. As that will cut their operating cost and make more profit.
banks will only use bitcoin if it is profitable for them somehow, otherwise bitcoin is threatening their existence and can potentially replace them.
also so far they have only shown interest in adopting the blockchain not the bitcoin itself.