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.
I think the bitcoin will adopt the bitcoin as soon as they are allowed to do so. The obstacle is the central banks.