You can't trust a central database but you can trust a central blockchain? A proof of work blockchain which is trustless and permissionless and has many nodes can be trusted to be tamperproof and immutable, but it is also slow and inefficient (thanks to PoW). A PoW blockchain is inefficient by deaign, it's a feature not a bug beucase that is what gives it's trust without trusting.
But when you make that blockchain private, trustful, and permissioned (only designated nodes can add blocks) you are taking away the very properties that make the blockchain immutable. And it has to be done because that is what enterprises would want. So an enterprise blockchain like Corda/Hyperledger is no different than a central database. And no serious business least of all banks would do their business on a public truly distributed open blockchain.
But when you make that blockchain private, trustful, and permissioned (only designated nodes can add blocks) you are taking away the very properties that make the blockchain immutable. And it has to be done because that is what enterprises would want. So an enterprise blockchain like Corda/Hyperledger is no different than a central database. And no serious business least of all banks would do their business on a public truly distributed open blockchain.