I see a gradual transition: new generations, accustomed to apps, may be more adept at Fintechs, never wanting to step into a bank branch. There is a whole generation of people still customers of the traditional system. For long-term banks to survive, they need to offer both systems - as many are beginning to do.
The current banks, which have branches, can hardly get rid of them in less than 10-20 years, depending on their clients accustomed to the agencies and their employees. In addition, they do the backoffice service, such as Treasury. These agencies represent assets to such banks - which are creating FinTechs to deal with startups.