There is one incredibly good use case for blockchain. Elections. Imagine elections run on top of the blockchain - you cannot erase, revert or cancel a vote. No one can tamper with elections anymore as all that is written there once, cannot be undone. Run on a private blockchain (elections are supposed to be private) with smart contract overlooking everything. The only problem is... the politicians. They will never go for it, at least not in 90% of countries because they know it would change politics forever. Same for electoral mandates that would automatically be terminated once some major fuckups are proved.