That is not a blockchain, it is a database. And there is nothing trustworthy about a database.
The banking system is already a failure, they have ripped us off enough. The blockchain has come to our rescue and that is why the banksters will never like the blockchain. It is time for the old to give way for the new, the bankster for the blockchain.
I agree with all you wrote @edith4angelseu with the exception of time. I do not think the banksters are going away soon. They still have a number of years left in them. This will not happen overnight.
Blockchain is still in its infancy...we will see a lot of growth over the next 10 years.
I know it will take time but it is already in the making, little by little, more people are flowing into blockchain because the veil is being lifted. But like you said, it's a matter of time.