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There is no need to run miners. They can use the "Practical Byzantine Fault Tolerance" consensus algorithm.

http://forum.hyperledger.com/t/hyperledger-vs-bitcoin/20

See my note to the other commenter. Hyperledger does not sell blockchains, they sell decades old replicated databases

There is so much blockchain hype at the moment, and this is my thought too. There only rational I can come up with is Bitcoin was the kick in the pants banks needed to realise they can go from 30 year old technology to 10 year old technology.

What Bitcoin solved was decentralized trust. I don't see any banks replacing their existing 'trust' network with code, they'll want to reverse transactions and mistakes, and will also want a veto over any distributed ledger.

Bitcoin solved decentralized trust, but at the same time, it solved distributed trust. What preexisting database product allowed multiple organizations to confidently write to a single shared database?

Distributed ledgers are perfectly capable of reversing transactions.

Smtp

Literally any distributed object store, filestore, or OS (see Amoeba and Globe). Only need to add some security enhancements to some parts as others did for that and other use cases.

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