Anyone attached with cryptocurrencies by investing in it or having some shares in it has complete control over their money and that is what banks are concerned and worried about. As this will completely eradicate the middleman that is the bank. Which will stop filling pockets of the group of people who somehow run the country by the taxes and all other penalties they give. This will lead to their destruction which they don't want and that's the reason they oppose it so much and it's a threat to the banks.
I came with conclusion that all the banks in the world are threatened. They realize
that Blockchain is better and people are joining. Every time when someone joins banks
lose! From 2010 until now how many people transferred their funds from banks into
Bitcoin? I doubt we can check info about that, what is sure is that that number is
rising.
Banks are big companies, some of them will find a way to adopt to the new system.
With money they earned until now, making new alt-coin for their own purposes can be
a good idea for them. It is Blockchain, they can try that, but they will need supporters
and followers, if they manage to find that they will be able to do a lot on this field.