maybe they consider bitcoin, If bitcoin or other cryptocurrency is widely applied, the whole banking system can become irrelevant. but it is in accordance with my knowledge contained in the article.
There is no point of denying this fact that all the crypto currencies are the biggest threat to the existing banking systems as with every passing day, more number of the people are withdrawing their money from the banks and that they are investing that money into different crypto currencies as they think of this to be more beneficial which is seriously affecting the reputation of the banking system.