The government and the banks won't allow the system of digital currencies to rule the world. Even if digital assets are more efficient, low cost and more secure, they won't allow it to happen simply because they have no control over it. And in the future for sure, cryptocurrencies like bitcoin will be the most effective form of doing financial transactions.
Banks really disagree with the existence of bitcoin. they consider this to be their competitor because of the blockchain that makes every transparent transaction able to create a new system that is more trusted.
There is no pint disagreeing with what they basically know that is impossible for them to control, them disagreeing with the system doesnt change things or that fact that people will continue to use the system with or without them. The least they would have just done is to see how the system can be regulated and how they can also work with the system.
Human beings are so easy to deal with, they just need to create a system that will give them confidence and at the same time, still be able to have control a little bit over it, but they would not want to explore that option because of their greed and the money they from the illegal charges.