The implications are much more than currency. The distributed nature and security embedded into a blockchain have far reaching implications, not just currency.
I agree, I see it being useful in many applications, but not as a standalone item. Trading a crypto currency is akin to trading empty cardboard boxes. The boxes value is in their ability to be used to package things. Same with block-chain - the ability to reach consensus on the origin and contents but they're being traded as the piece of value itself, which makes no sense to me.