Wrong title!
What the big banks are creating is not a BTC alternative, nor is it against BTC at all. BTC is a cryptocurrency with an open public ledger. The big banks are creating a large distributed record book, but it won't be public (it's only for big banks), and it won't be associated with a cryptocurrency.
I like it. The big banks are doing their thing, and they don't mess around with BTC.
Big banks could use a large tamper proof distributed record book, but don't want to pay for the running costs of mining the bitcoin network. They have their R3 blockchain group which recruited bitcoin core developer Mike Hearn to make a system that's 100% under their control because they can't control bitcoin.