I agree that blockchain isn't great for currencies (as we understand them). It seems potentially great for tracking rights in situations where there are multiple parties and those parties may be adversarial.

Imagine a blockchain system for tracking who has the rights to stream a movie. Copyright holders can issue 'coins' with the streaming rights to users' accounts, everyone signs a contract saying the blockchain is authoritative - now you have an open market on streaming. Any streaming media company can stream you a movie assuming you have the token. Users can run their own blockchain network to maintain the system if the companies move on.