Re efficiency, yes, 100%. But the value of a financial network rests on three things: adoption, adoption, and adoption. Bitcoin has it, and weird hacks to bolt on new features are easier than building widespread adoption of an altcoin.

Re organisations, yes 100%, but there are valid corner cases like trust-less futures contracts that are now somewhat possible. A widely trusted oracle on local weather could feed into a self-executing contract that either pays out or does not pay out based on events, allowing Weed Farmer Ted to securely stay in business during a drought, even if he has to pay some of his profits to counterparties if instead its a good year. No lawyers required, and no vampire middlemen.