Banks are starting to use blockchains to send bank wires that confirm in minutes, it's still centralized wires of fiat money that you have to store with a bank if you want to store it digitally but do you think it's good or bad for Bitcoin adoption in the short/medium term ?
Have you any links to articles that back up your statement? and even if they are that has no effect on bitcoins decentralised nature which is one of its key features. the banks will never have that.
Here you can find a lot of articles/examples about the subject. Banks doesn't develop a new currency, they just need a new system to handle time consuming and administrative everyday tasks and processes. It will be neutral to bitcoin, because the banks' customers usually don't care about the technology behind the scenes, as long as their orders are completed. If banks implement a new technology, the customers will only notice if the processes become quicker or easier, because banks won't change the UI if they change the core inside their system. Customers (and everyday people) won't have a clue about the similarity of the banks' system and bitcoin's system, so it won't legitimate bitcoin.
