There are many people who still dont know about bitcoin, so I guess bank will take this advantage to announce them that the bank has made a revolutionary currency for them. Since those people are trusting bank, and always hear bad news about bitcoin, there is a possibility for bank to get success from its cryptocurrency.
This is what I mean when I say that Banks will try to fool and manipulate the masses. The consumers, clients might use a centralized completely controlled digital currency although a fully decentralized one which offers them freedom and independency is right next to them.
The very essence of Bitcoin is what will make it last. Bitcoin may not last forever in its actual form, but the fact that it isn't dependent on any government or institution will eventually convince a greater audience and further spread it's use. Physical money is an ancient concept, it's time we start living in the 21st century.
Even though we will use a cryptocurrency in future, I guess governments will make their own cryptocurrency instead of choose bitcoin as currency for their people.